I came to visit my fiancé on the 10th-17th of feb. 2010. I went to the er and they said my due date was the 8th of nov. yet my obgyn said 22nd of nov. can you help me with the day I conceived?

Would certainly be within that range.
Of course by now you would have actually had the child, so the date of conception is moot really.

No one can tell you the date; there's no specific gestation period. You have a smaller range than most people, one week.

Assuming you did not have sex with someone else, why does it matter ?

There is no way to be that exact, give or take a few weeks or a couple weeks is about as close as they get.

Is there a reason the exact date is an issue

I just want to know if it is possible for me to have conceived on the 14th of feb and have a due date of the 22nd?

Well with in the time scales, yes.

Due dates are guesses , estimates, although educated ones. They go by the information you provide the doctor and from size of the baby during exams.

Again, why the worry about the exact day ?