[rebecca1932]

How accurate is an Ultrasound!
I had my last period on March 20th.
I had sex on the 27th, 28th, 29th,30th. Then again on April 4th, 5th, 6th, 7th and 9th.
I had my ultrasound recently and she said I was 17 weeks and 2 days. (This was a few days ago) I counted back 17 weeks and 2 days. And It was the 26th! How is that possible if I didn't have sex until the 27th and then on? The 26th was 7 days after the start of my period. My period was just finishing up then

[J_9]

Early ultrasounds are very accurate.

If your period started March 20, then as of today, July 28, you are currently 18 weeks and 2 days with a possible conception on or around April 3 or 4.

[rebecca1932]

How is that correct. The ultrasound woman is saying right now I am 17 weeks and 5 days as of today. If you count back 17 weeks and 5 days. It's the 26th of march. I did not have sex on that day or previous days. I started my period March 20th and never had sex until the 27th.

[Fr_Chuck]

Because they go by average size, it is never exact to a specific day, it is give or take a week at the very best. So count back 16 week 5 day and see what that gets. Then all days between.

There is never one exact date if that is what you are thinking

[rebecca1932]

If you count back 17 Weeks from today. Then you get the day that I supposably ovulated. I understand that I just didn't understand how she got I was 17 Weeks and two days pregnant.. (on July 25th)