Just a quickie. I was wondering when you guys count your pregnancy from? Might sound obvious but I'm really confused as to whether I'm 7 weeks (if you count from last period) or 5 weeks (if you count from when baby was most likely conceived - around time of ovulation) With different information flying around about what to expect at week 5 and week 7, I wish I knew which one counts!
Also, does anyone know if the length of cycle affects due dates? My doctor obviously calculated my due date based on a 'normal' 28 day cycle, but mine's more like 31 days, and an online calculator I used took this into account and gave me a later due date than doctor did.
I know it's all estimation and guesswork at this early stage, but anyone know which is most accurate?
The gestational age of the baby is calculated from the first day of your last menstrual period. Since the exact date of conception is almost never known, as ovulation can vary, the first day of the last menstrual period is generally used to measure how old the baby is.
When you have your first scan the doctor will give you a more accurate date based on the CRL of the baby.
You're considered universally as 7 weeks (counted by your last mentral date), but later when you do a dating scan, the doctor will be able to tell you more accurately how far along you are. And yes, you're right, it does matter how long your cycles are... didn't your doctor ask you that? They usually do.
My cycles tend to be a little longer than 28 days as well, and my midwife told me she will extend my due date by the extra days on my cycle. For instance, my due day on July 26 is extended by the three days extra between 28 days and 31 days, so I'll be July 29th.
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