Confused on the math of conception. Can someone help?

AlwaysPraying · Mar 23rd, 2012, 16:04 PM

So we ovulate and have sex within days of each other. We try to have sex before we ovulate. I get that. But can't it take 6-14 days for implantation? Do pregnancy tests show positive before implantation? Or does it have to implant before a positive test to show?

So say its a normal 28 day cycle ovulating on day 14. So the person gets pregnant on that day and misses the first day of the next period. Tests on day 29 and it shows positive. Does that mean that the fertilized egg just implanted within days? Or did the egg ipmant earlier? So how long is that person pregnant for?

They say that at the first positive pregnancy test that your 1 month pregnant. But in actuality you weren't pregnant for even half that for sure. So how long is that person pregnant for?

Clearly this is personal I wrote a post with my dates and testing etc and waiting to hear what you think. I'm 1 day late but with a positive test and in severe denial. I'm going to wait another week to see if my period is just late.

Confused!!!!!!

brittany12 · Mar 23rd, 2012, 16:45 PM

ovulation happens on cd14 (in your example) the egg has to be fertilized within 12-24 hours otherwise the egg dies. If it is fetilized it takes anywhere from 5-12 days for the egg to travel and implant. Once it implants it takes generally about 3 days for your body to produce hcg into your urine.

So if you test positive on cd29 your egg could have implanted anywhere from cd 6-12. It is hard to say for sure when you ovulated unless you temp and take opks, but you do know for sure when you started your last period because you bleed. So drs go off of your LMP to give you an estimated due date. So you are pregnant two weeks before conceiving.

Hope you can understand that lol...

Deethehippy · Mar 23rd, 2012, 17:01 PM

A pregnancy test cannot show positive before implantation as said above.
Generally speaking a test taken 12-14 days after you ovulated should give an accurate result however some women do get later positives.

Good luck to you

AlwaysPraying · Mar 23rd, 2012, 18:07 PM

By my numbers I would have implanted between 9 days ago and 3 days ago. My positive is extremely clear (did another today to be sure). Seems early to me to test so positive. Then again based on my calendar I am technically 1 day late so well within testing rules.

brittany12 · Mar 23rd, 2012, 18:36 PM

you may just produce higher levels of hcg or maybe you indeed implanted 9 days ago which would give you great levels!

mammag · Mar 23rd, 2012, 19:26 PM

1 day late is typically about 7-8 days after implantation, which is perfect timing for a nice dark line. And you are right about us not being 'pregnant' for half of that, doctors just go by our LMP to make things easier.

AlwaysPraying · Mar 23rd, 2012, 21:00 PM

Alright! I think I have it understood!

L.E. · Mar 23rd, 2012, 23:47 PM

Agree with above posters... Doctors calculate due date based off of the first day of your last period because most people don't know exactly when they ovulated. With my son, my due date was originally Aug. 29 but when I had my early scan it got changed to Oct. 27th lol... and then he was born Nov. 6. So according to scans I was 12 dpo when I got my bfps and they were very dark. Congrats!!!

AlwaysPraying · Mar 24th, 2012, 00:14 AM

I don't know when I ovulated but I know the two days we had sex. So that's got to mean something right? We had sex on ovulation day according to my ap then again two days later and that was it for the month (ok again a few days ago. It that doesn't count). Is it safe to say that between those first two times was when it happened?

CutenessANR · Mar 24th, 2012, 01:29 AM

if it is that dark that soon...could be multiples

Mar 23rd, 2012, 16:04 PM	#1
AlwaysPraying Mum (Mom) BnB Addict Join Date: May 2009 Location: Canada Posts: 4,147	Confused on the math of conception. Can someone help? So we ovulate and have sex within days of each other. We try to have sex before we ovulate. I get that. But can't it take 6-14 days for implantation? Do pregnancy tests show positive before implantation? Or does it have to implant before a positive test to show? So say its a normal 28 day cycle ovulating on day 14. So the person gets pregnant on that day and misses the first day of the next period. Tests on day 29 and it shows positive. Does that mean that the fertilized egg just implanted within days? Or did the egg ipmant earlier? So how long is that person pregnant for? They say that at the first positive pregnancy test that your 1 month pregnant. But in actuality you weren't pregnant for even half that for sure. So how long is that person pregnant for? Clearly this is personal I wrote a post with my dates and testing etc and waiting to hear what you think. I'm 1 day late but with a positive test and in severe denial. I'm going to wait another week to see if my period is just late. Confused!!!!!!

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Mar 23rd, 2012, 16:45 PM	#2
brittany12 Trying to conceive (TTC) BnB Addict Join Date: Jan 2012 Location: South Carolina Posts: 5,161	ovulation happens on cd14 (in your example) the egg has to be fertilized within 12-24 hours otherwise the egg dies. If it is fetilized it takes anywhere from 5-12 days for the egg to travel and implant. Once it implants it takes generally about 3 days for your body to produce hcg into your urine. So if you test positive on cd29 your egg could have implanted anywhere from cd 6-12. It is hard to say for sure when you ovulated unless you temp and take opks, but you do know for sure when you started your last period because you bleed. So drs go off of your LMP to give you an estimated due date. So you are pregnant two weeks before conceiving. Hope you can understand that lol...

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Mar 23rd, 2012, 17:01 PM	#3
Deethehippy Mum (Mom) BnB Addict Join Date: Aug 2010 Location: Bucks, England, UK Posts: 8,476	A pregnancy test cannot show positive before implantation as said above. Generally speaking a test taken 12-14 days after you ovulated should give an accurate result however some women do get later positives. Good luck to you

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Mar 23rd, 2012, 18:07 PM	#4
AlwaysPraying Mum (Mom) BnB Addict Join Date: May 2009 Location: Canada Posts: 4,147	By my numbers I would have implanted between 9 days ago and 3 days ago. My positive is extremely clear (did another today to be sure). Seems early to me to test so positive. Then again based on my calendar I am technically 1 day late so well within testing rules.

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Mar 23rd, 2012, 18:36 PM	#5
brittany12 Trying to conceive (TTC) BnB Addict Join Date: Jan 2012 Location: South Carolina Posts: 5,161	you may just produce higher levels of hcg or maybe you indeed implanted 9 days ago which would give you great levels!

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Mar 23rd, 2012, 19:26 PM	#6
mammag Trying to conceive (TTC) BnB Addict Join Date: Nov 2008 Location: Ross, OH Posts: 9,322	1 day late is typically about 7-8 days after implantation, which is perfect timing for a nice dark line. And you are right about us not being 'pregnant' for half of that, doctors just go by our LMP to make things easier.

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Mar 23rd, 2012, 21:00 PM	#7
AlwaysPraying Mum (Mom) BnB Addict Join Date: May 2009 Location: Canada Posts: 4,147	Alright! I think I have it understood!

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Mar 23rd, 2012, 23:47 PM	#8
L.E. Trying to conceive (TTC) Chat Happy BnB Member Join Date: Sep 2010 Location: Ohio, USA Posts: 1,595	Agree with above posters... Doctors calculate due date based off of the first day of your last period because most people don't know exactly when they ovulated. With my son, my due date was originally Aug. 29 but when I had my early scan it got changed to Oct. 27th lol... and then he was born Nov. 6. So according to scans I was 12 dpo when I got my bfps and they were very dark. Congrats!!!

Status: Offline

Mar 24th, 2012, 00:14 AM	#9
AlwaysPraying Mum (Mom) BnB Addict Join Date: May 2009 Location: Canada Posts: 4,147	I don't know when I ovulated but I know the two days we had sex. So that's got to mean something right? We had sex on ovulation day according to my ap then again two days later and that was it for the month (ok again a few days ago. It that doesn't count). Is it safe to say that between those first two times was when it happened?

Status: Offline

Mar 24th, 2012, 01:29 AM	#10
CutenessANR Pregnant (Expecting) Active BnB Member Join Date: Mar 2012 Posts: 267	if it is that dark that soon...could be multiples

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