Help with paternity

[arik23]

Hi so I have a query about pregnancy, I am suffering with insane amounts of anxiety and have not been able to relax. Let me start by saying I do not know the exact date of my LMP as I hvae always had really light periods usually one or two days bleed,and the months are abit blurry.

So I had sex with guy1 on around 25th of September.-

Unsure If i had my period which would of been around 8~10th October.

I then had sex with guy2 from 1st October, whole of October,November untill now...

Found out I was pregnant on November 19th with blood tests, dating <5.3 weeks.

Went for first and only ultrasound on January 3rd , which dated me 12w 1d. Due date 17th July 2022. That would of meant I did have a period around the 10th, I just didnt not remember it.

I have looked over and over and have not stopped racking my brain , but it says with this due date, conception must of been around October 24th .

Have another scan on 21st Feb, which should make me around 19 weeks.

Please help me rest my mind, is it only possible guy 2 is the father? Please no judgement. I am extremely stressed, I jsut want to believe the science!

[AnnieBrooke]

A 12th-week scan can reveal that a baby is a little more advanced or developing a little more slowly than average, because the longer you are pregnant, the more a faster-growing baby or a slower-growing baby will diverge from average sizes. But, it will not be 4 weeks off when you are only in your 12th week. By then a doctor using ultrasound readings to tell you how far along the baby is might say "give or take 7 days," not "give or take 28 days" -- babies' development can vary, but not that fast. (This is also not going to mean yours is off at all, either. My son measured right with the averages for my whole pregnancy.)

So take care and stop worrying. There are no questions here except things your mind is making up. We can think of a thousand things to scare ourselves, but that doesn't mean any of them are true. If you want, you might talk with a counselor about what might be feeding your anxiety here. I can almost guarantee that it isn't the question of paternity, no matter if your conscious mind has settled on that or not. Address the underlying causes of your anxiety and worries about paternity will fade away.

[AnnieBrooke]

No, the first guy is not the father. If he was, your baby would have been in its 16th week when you had the ultrasound in early January. The people looking at your ultrasound went to school for a long time to learn to do this kind of work, and even someone without medical training would not confuse the development levels of a 12th-week and 16th-week baby for each other, they look so different. Do you have a copy of the ultrasound? If so, you can look up ultrasounds of babies at 12 and 16 weeks GA yourself, and see yourself that your baby is only as developed as they told you.

[arik23]

Yes Ive had a look and struggled to find to much but can tell from the few Ive found... Thankyouso much for your help, I know its just my brain going into a mess with the thought maybe guy2 is not the father.  I even started making myself so paranoid, thinking my belly looks bigger and  Ï must be four more weeks along or what if the scan changes at the 19 week one. Ive always trusted science yet my brain just wont accept with this...

Do you believe 12 week dating scan is extremely accuarte? Thanks again for your help...