I had sex on December 31st with someone ( other than my bf). That was the first day of my period also. Early February I had a positive pregnancy test ( 10 of them). On February 11 I start bleeding and on February 13 I eliminate a big clot with tissue and yellow and grey dots. I had also pains. After that all my pregnancy symptoms were gone and my pregnancy test showed negative ( 2 of them). I was bleeding about 10 days. On February 15 I went to a sonogram and the doctor said that my uterus is clear and there is nothing inside.after 5 weeks I had my period ( March 17), and then on April 22nd I found out that I was pregnant . It's true since March me and my boyfriend are trying to have a baby . My boyfriend has lazy sperm. I went to a sonogram on April 29 and the doctor said that I am around 4 weeks pregnant . My question is if this pregnancy could be the same from the 31 st December sex ? Is it possible? Is it possible that at the sonogram from February the doctor couldn't see the sac cause was too small? Is it possible that this sonogram from April to show a pregnancy if 4 weeks but to be pregnant in 2-3 months?I know very well the process of conception, sperm, ovulation, fertilization but I am still concern... I know what I did was wrong in December, I got my lesson but I am truly scared. I tried before with my boyfriend to have a baby for past 1.5 years and nothing happened... It is true that we were very stressed in that time and now for the past 6 moths the stress is gone and boom I am pregnant. Please give me an advice. Since December nothing happened with anybody else, just then, once... Other ultrasounds that I had: June 9 show 10w5d pregnant June 18 : 12 weeks (CRL 5.4 cm) June 24 : 13 weeks July 14 : 5w5d July 22 :17 weeks August 12 :20 weeks What do you think, the sex from December 31 st 13 is out from this conversation? Has something to do with the pregnancy? Please help!

If you are still pregnant since the end of 2013, you'd be almost eight months along.

Be assured that your boyfriend is the father of this baby. An ultrasound on April 29 would have put you about 19 weeks if you had still been pregnant from December. There is no question that this could not be from the December encounter.

Thank you ladies.The guilt is killing me and make me anxious... I can't sleep and I can't enjoy my actual pregnancy .I know my concerns maybe are not grounded but is impossible not to think. I hate myself for what I did .
Then I guess I had a miscarriage in February and I got pregnant again at the end of March,beginning of April,right?
Please don't call me crazy even I I know I am so close to became crazy with all this stress that I feel.
So there's nothing to worry about? I really can't talk to my doctor cause my boyfriend is attending to all my visits and I am never alone (this make me realize over and over what a special person he is and what a monster I was).
Thank you for your time !

You have every right to attend a doctor's visit without someone else attending. I know you don't mean he is forcing you, but why can't you just say you would rather talk to your doctor alone for once, so you can discuss in private what is eating away at you. You deserve to be stress free while pregnant.

Girl I had to say something. Okay from reading this story sweetie, you had a miscarriage from the December 31 pregnancy. U specifically said you removed a big clot with yellow and grey dots. That my darling, was your baby. Then you stated that you were bleeding and having pains. Yes my child you had a miscarriage. Don't fret at all girl, you had the miscarriage from the other guy, it wasn't meant to be with him. The child you are carrying now, is indeed your boyfriends. So just stay calm for you and the baby and everything is going to be all right.

Nothing to worry about in regard to who the father is. At your first ultrasound it would be very obvious. Often not much at all is seen around 4 weeks. Maybe the gestational sac might get picked up by a trained eye. If you had been pregnant from the December encounter when you had the ultrasound in April, baby would definitely have been seen... at about 6 inches long and mostly developed.

Your other scans were on track as well. On that note, is there a particular reason that you have had numerous scans?

As Wondergirl said you would be about 35 weeks at this point if you had been pregnant from December.

You can't change the past. You realized that you made a serious mistake and you have learned from it. Now look to the future and try not to let this special time between you and your boyfriend pass by without enjoying it.

Thank you for your help ladies.
DoulaLC the reason why I had so many scans is because I went to another 2 doctors (others than mine) just to see if he tells me something different,but no,all doctors agreed that I am how further along I am. I was (and I have to admit I still am) terrified of the fact that this baby could be the other guy. But as you all told me this is not possible,the differences between the intercourse are pretty consistent (2.5 months) and this will put me at 33 weeks with a due date around October 7..
I am trying to convince myself that is impossible such a big error but my mind keep think about it and makes me worry. Your answers helped me a lot and I will try to stay positive.I will pray for the forgiveness of God and also I promised I will never cheat again.Stupid me... I still wonder how I could be so weak.
Well, I will keep you post it .This baby has to be my boyfriends.
Once again thank you for not letting me fall in a depression.

U are so very welcome girl. Just keep you head up and have a great pregnancy. Don't stress cause it puts stress on the baby. Enjoy this time with your boyfriend and unborn. Pretty soon, the day will come.