please help

[James8787]

So my gf admitted awhile ago to having gotten drunk and hooking up with someone during a break we were on. She was due Jan 1st and just had our son on Jan 4th. She was with the other guy on April 1st and me on April 9th and since then. They didn't go based off lmp because she has late periods/irregular. But she had he first Us at 18 weeks, one around 21.5 and a few after that to check on growth because she had a small bump and the baby measured small. Everything was perfectly healthy on him though so the doctors didn't worry or change the due date. After birth she had a retained placenta and had to go under for the doctor to remove it. Idk if that affects anything or not.

[James8787]

Thank you so much Annie :), have a blessed day

[James8787]

She had a period March 21 though.. which should have made her ovulate on April 4th if it was a regualr cycle supposedly from what I read online. do you think that changes anything?

[AnnieBrooke]

No, because counting forward from a period is a road to nowhere when trying to determine when a woman ovulated.

What you read online probably said that a woman ovulates 14 days *before* her next period, not 14 days after her last period.  Only a woman with super-regular, clockwork 28-day cycles could expect to (probably) ovulate at day 14 after her last period.  Why do you think it is so hard for people to get pregnant when they try?

The first step in a woman's cycle is not her period.  It is that her ovary pops out an egg.  The next step is, 14 or 15 days later, the body decides if it is pregnant or not, and if not, it sloughs off the lining of the uterus (a period).  

Then only when it feels like doing so, the body puts out another egg.  This wait can be a long time.  Nothing about when the last period happened to come, causes the next ovulation. Periods don't prompt ovulation. Ovulation is always the starting step, and the period is the ending step.  

Anyway, once someone has information from ultrasounds, ignore all information about when the woman's last period was.  It isn't helpful and can be very confusing.  The ultrasound has seen and measured the actual baby, that is the best data.

[AnnieBrooke]

James, it sounds like you are the daddy all right.  Certainly, just so you will never have to wonder about this again, you should probably get a DNA test, but a January 4 birthday indicates conception quite enough later than April 1 that I wouldn't worry.  Here is what the conception calculator I use says:

January 1 due date:  conception April 10

January 4 due date:  conception April 13

If you told me the baby seemed unusually large, or the doctors said he seemed to be overdue, or that the baby was a girl, then we would have to do some more analysis involving the margins for error in ultrasounds from the 18h week added to how long sperm is viable, but this kind of concern doesn't seem called for by the details of your story.  It sounds like you got her pregnant when you got back together.

[James8787]

Her lmp was March 20th also but like I said she's always late to get it