I had intercourse ONE TIME with guy A (unprotected) sometime in Jan 2013 I dont know which day exactly but it was after Jan 7th and before Feb 1, 2013. I don't remember if he ejaculated inside of me but when I asked he said no. My lmp was from Jan 20th-Feb15th I have irregular periods. I was suppose to get my next one on March 17th but never did (due to irregular periods) I then had sex with guy B starting from March 20th-April 23rd (unprotected) we had sex everyday sometimes 2 times a day. On May 21st 2013 I had my first ultrasound and I was 9wks 3days with a due date of Dec.22. We didint go by my lmp which was in January because it didint match up to my due date. I never got a period in between the two guys which worries me a little but not too much b/c if I missed my period on March 17th due to being pregnant I would have had a different due date. Plus I took a blood test on April 6 which was negative then again on April 18th which was positive.