unsure of conception

[hol1127]

So my last period was June 19 which gave me a due date of March 26. I had sex on June 30 and ovulated either July 3 or 4 which matches up with my due date. My 12 wk u/s measured me 1 1/2 wks smaller changing my due date to April 4. I also had sex July 10 which was after I ovulated but this date matches up with the newer due date. Which time could I have gotten pregnant?

[hol1127]

That's what I east thinking but I wasn't sure. I'm on baby #3 and my last one was on the bigger side, my first is 4 now and still petite as ever. This baby takes after him.

[sweetdrop1234]

Sometime it may show a week or two off and the further you get they Can get a better date and how far u are I wouldn't stress.

[hol1127]

Thanks so much for all your help. This whole conception thing had my mind going crazy and it's like I have to have things answered or I just go insane.

[elen83]

It will be hard to determine when you conceived as ovulation is never predictable. Best is to go with your first day of last menstrual cycle to get an approximate due date if that's what you're wondering.  Other than that it's really hard to say especially when we have active sex lives. :)

[hol1127]

My periods are always regular in a 28day cycle Maybe off by a day or two. So how many days off would ovulation be? According to the newer due date it has me ovulating July 12 instead of July 4

[wayfunmommy]

It could be possible. It could also be possible that you ovulate on a different day than you think you do. Those calculators use the 14 day ovulation assumption.

[hol1127]

I found a reverse due date calculator online which allows you to enter your due date and get the conception date. However it said my expected period would be July 26, but it should have been July 17. Could it be possible that the 1st due date was correct and the baby is a bit smaller?

[hol1127]

I had an app on my phone that calculated my ovulation based on my periods.

[wayfunmommy]

Do you chart your ovulation to know of exactly when you ovulate or are you guessing based on the 14th day average?  Many people actually don't ovulate on the 14th day. Some women ovulate way earlier or way later. It is all up to your body.
Plus, conception can happen up to three or four days after ovulation.
For instance, if you have been assuming you ovulate around the 14th day of your cycle but actually ovulate on day 18 and have sex on day 20, you can conceive then.

[blessedwithanest]

I've been reading a lot about ovulation, and ovulation charts are not something to go off of because you can ovulate multiple times some months.