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The u/s shows the time of gestation right from day one....so yes, technically it includes those two weeks! I see by your tickers you are due the same day as me and according to my chart, I o'd on or around May 12th and would have conceived at that time as you only have a 12-48 hour window (give or take of course). If you have a pretty regular schedule, you probably o'd around the same time as me, also give or take a few days as not all women on on CD 14. Most likely though, conception would be around the middle of May! So when you find out your pregnant, you would have missed a period...you are already a month or 4 weeks pregnant but technically two weeks or since conception! I know I am being confusing....basically you count right from the date of your LAST period. So if you u/s shows you are 9 weeks, then you are 9 weeks! So if you know the date of your last period too, you can back track and it should also tell you that you are 9 weeks give or take a few days since the baby could be measuring big or small! I am due Feb 1 and my last period was April 27. That makes me 10w tomorrow even though I didn't actually conceive until middle of May! Make sense? Hopefully I didn't confuse you more!
The reason that a conception calculator may say you ovulated then actually conceived a week or so later is that it generally takes 7-10 days after sperm meets egg for the fertilized egg to implant into your uterus.
A sample timeline would be
May 1- first day of last menstrual period
May 13- dtd
May14- ovulation occurs, sperm meets egg
May 21- egg implants into uterus (at this point, although you would not know you were pregnant, you would technically be considered 3 weeks preggo)
May 31- no show by AF, which is what leads many women to test. You would be one month pregnant already at the point of bfp.
Every woman's cycle is different, many women ovulate later in their cycle than the exact midway point, some women have longer cycles. But univerally speaking, your pregnancy offically begins two weeks before ovulation occured. So, your little beanie was conceived roughly seven weeks ago...give or take a few days based on your individual cycle.
First poster explained it very well. And our cycles are almost the same as well. LMP was April 28th, DH and I DTD on 5/10, And I ovulated around the 12th or 13th. Your best chances of getting pregnant is within 2-3 days before ovulating. My EDD is 2/2. Doctors have me at 1/30 because baby was measuring 10 weeks 1 day as of yesterday, but know when I ovulated so...
I will just add that going off of your lmp is not accurate if you don't have a textbook 28 day cycle with ovulation on cd 14. If you fall in that category, like me, it is more accurate if you know when you ovulated and start counting two weeks before that. If you've never charted and don't know when you ovulated and do not have a textbook cycle (which you couldn't know if you have never confirmed ovulation even if you have a 28 day cycle since you could be an early or late ovulator), then ultrasound dating is your best bet. The ultrasound tech or your doctor usually tells you if it is gestational age (without the two weeks pre-o added) or not.