When did your OPKs start getting darker after O?

[melewen]

For those of you who saw OPKs getting darker after ovulation and got a BFP, when did they start getting darker?

I've been taking opks since I got a positive because I actually O'd early which like NEVER happens for me. I wanted to make sure I didn't miss it - but it's been confirmed with temps now. After I ov'd they were pretty light but now it's getting quite dark. I'm only 6dpo though! I do remember with my first I got a fern on my microscope on like 2dpo. It was so weird and one of my unusual symptoms that led to a BFP

 

[Cppeace]

Opks typically won't go positive until after a hpt will. Sometimes opks never go positive when pregnant.
As for when they would darken I'd say if it happens for you it will start darkening 9-11dpo a day or two after implantation is likely.
The reason opks can go positive with hcg is because it is a very similar chemical to LH and it overwhelms the opk into reading wrong.

 

[melewen]

I've heard otherwise, so I'm curious for actual experience

 

[maryanne1987]

Mine always darken when AF is approaching. The month I got my bfp they darkened as usual but they didn't turn postive until a few days after my bfp. I'd got a positive digi before my opk's had turned positive. Hope you get your bfp this month

 

[melewen]

That's very weird! Mine are always super light after. At least it's something to do this month

 

[Cppeace]

It's common for opks to go darker just before AF because that is when estrogen begin to rise and can sometimes cause a small LH surge.

As for "actual experience" I've had a miscarriage and chemical pregnancy and the only time my opks got in any way what I'd call dark in the tww was the same day as a bfp.

Everyone's experience can be different, though. But OPKs getting very dark or going positive before a hpt is going to be uncommon at best and most likely very rare and triggered by an estrogen surge from implantation and not the HCG.

That is logical.

 

[melewen]

I'm nowhere near AF but thank you for your help.