If you cheated on your boyfriend with someone then had your period, it is unlikely he is the father. However, you will probably need a blood test to be sure since you had sex with both of them within the same week. I'm assuming that is the 'conception' week?

Good luck.

im in the same boat as u exept i didnt have a period so i really dont know who the father is

my cycle is 26 days long last two LMP was 8/6/08 8/31/08 i am now pregnant i had sex on 9/11/08 with an old friend and with my husband on 9/14/08 i am really worried i really want this baby but i am afraid who the father maybe... who is the most possibly the father maybe please help me somone

The dates are too close to know who the father may be without a DNA test.

I am in the same situation i had sex with a guy on the weekend of nov 6 i did have sex with a ex on the 11 of nov my last period was on oct 25 i guess i also wont know who the father is

you can use an ovulation predictor calendar (software) to give you a bit more clarity to who it might be .. they are very detailed!

Hey i no its late but i just wanna ask again. Im 38 weeks pregnant. The first day of my last period was Jan. 31st. My period was irregular b/c i was taking my birth control wrong. I slept with my boyfriend all Jan. and the first couple of weeks of Feb., but i also slept with my ex atleast after Feb. 16th im not sure of the date. Who is the father if im due Nov. 7th??