Hello !! I m in desperate need of your help. I m very alone and scared. I had sex with partner 1-(my husband) July 4,5,6,7 ( possibly other days between 7-14 not positive) And partner 2 July15. Partner 2 was a mistake and I took the plan b pill with in 72 hours. I got pregnant. My first day of my last menstrual cycle was June 21st. My periods are a little irregular. My husband and I have been trying to get pregnant for several years which has also caused a strain on our marriage hence the selfish one night stand. Needless to say when I learned I was Pregnant I was overwhelmed with joy and so was my husband. I immediately ruled out Any possibility of partner #2 being the father because of my likely ovulation days, the date I was given as my due date and my faith in the morning after pill. My husband and I continued to grow closer and excited in this journey. I vowed to myself and to God to never cheat on my husband again and that i would be the perfect wife and mother. For some reason I never got a first trimester ultra sound. I Had my first ultra sound on On Friday oct 28 and my world came crashing down around me. As the ultra sound tech was doing his measurements he commented the baby looked about two weeks small. The ultrasound measured me at 17 weeks 2 days.  My period put me at 18 weeks and 3 days. So That was only a 8 day difference. The doctor said the baby could just be small. My husband and I were both small babies. He didn t change my due date which is march 28th. He scheduled me to come back for a second ultra sound in 4 weeks to make sure the baby is still growing. Is it possible that we just missed a growth spurt and he ll catch up? How accurate are ultra sounds in the second trimester in pin pointing conception dates? Is there error the later in pregnancy that ultra sounds are done ? Ive read there could be error up to 2 weeks in an ultra sound done this far along. When I put the dates in the conception calculators It says he was concieved on July 13th which makes it impossible to be #2. Is it possible to have sex on the 8th and concieve on the 13th? I know you ll suggest a DNA test but partner #2 gave me the option of an abortion or to never speak to him again and assume it s my husbands , I Assuredhim it was my husbands after receiving my due date and haven t spoke to him since. Please Any information you can give me would be greatly appreciated! Sincerely, Lisa