The conception calculator I used (not always 100% accurate) says that your date of conception was most likely around May 9th. Was your due date calculated by ultrasound measurements? If so, then you most likely could not have conceived before the 5th of may in order to be 9months on January 30th, so as long as your fiance was the only one you slept with after the 1st I think he is the father, but it's all guesswork unless you want to do a paternity test (DNA) once the baby is born.
i just need a clear head for these last few weeks.. i have done nothing but worry and be ashamed at myself through this whole thing, dont get me wrong i love the fact that i am preg. and that i can get pregnant, i just am not sure about my situation.