I hooked up with this girl on feburaury 27th. An she is now pregnant. But one month before her an I got together she was with her ex boyfriend an they had sexual relations on the 27th of January. Now that she is pregnant it makes me wonder if I am the father of this baby. How can I find out whether I am or not with out hurting her feelings?

DNA tests

She is aware that she had sex with both of you close together so it should be expected the you'd ask her for a DNA test. Her feelings shouldn't be hurt.