I have been in a new relationship since February. I was with my ex last on January 19th. Today I am 13 weeks pregnant. My current boyfriend never b***ed in me, so I am terrified that this baby could be my ex's. I don't have any knowledge on fertilization and all that. I bled what I believe was a normal period in February. I didn't think anything unusual of it. I am beyond stressed and I really don't want my stress getting in between my pregnancy. I just want to be sure of my answer and go on with my life. Can someone with knowledge please help me out!!

Far to close and lacking information to determine without a DNA test.

Did you have unprotected sex with you current b/f ? The time is close, but yes, only a DNA test will determine the father, after the baby is born.

If you last had sex with your ex January 19th, had what appeared to be a normal period in February, and are 13 weeks pregnant today... the baby would be your current boyfriend's. If baby was from your ex, you would be about 17/18 weeks if going by likely conception with your ex.

Have you started feeling any movement, or flutters yet? When was your period in January and when in February? Are you usually pretty regular? Was the 13 weeks determined from an ultrasound? Did you have an ultrasound earlier in your pregnancy, and, if so, when did you have it and how far along was your pregnancy determined to be?