please help

[taz310]

ime really worried about weather or not the ultrasound was right what i had and it said i was 7weeks on the 24th of march 2010. me and my boyfriend split up for 6months last year and on the 31st of december i slept with this guy who ide had a little  fling with..i got back with my boyfriend around the begging of january and he has been my only partner throughout jan.. i did a pregnancy test on the 8th of jan but l dnt no if that was to early to tell as it was negative.. i then had a period around the middle of january or so i think it was a period it seemed normal i just cant remeber it lasting very long.. but ye like i said when i went for i scan it said i was 7weeks on the 24th of march which would mean i fell on at the begging of feb..2010.. also when i went for my 12week scan it said i was 14weeks which by my calcuklations i should have been 13weeks and a few days ime really confused and i hop someone could tell me what they think about the situation could this ultrasound be wrong by 4weeks or so becoz i dont no what ide do if i fell pregnant with the other guy i love my boyfriend so much and ime so happy we got back together.. pleas help some one

[AnnieBrooke]

What due date did they give you at the first scan?  The due date for sex on December 31 would be September 23, no later.  If the due date they are giving you is a lot later than that, you can rest well assured that the baby is your boyfriend's.

A scan at 7 weeks is much more accurate than later scans.  Ultrasounds can be off by a week, but not by 4, especially that early.

If you were dealing with only a week's difference, I would be concerned and would be planning a paternity test once the baby is born.  

[taz310]

someone please leave a comment it would be much appreciated