because you have irregular periods, only a doctor will be able to tell you whenyou conceived and how many weeks you are. normally they go by the first day of your lmp (which you said was 2/11), so based on that you would be 5 weeks on sunday.

also, because you have irregular periods and don't know when you ovulate, either one of the 2 guys could be the father. because you slept with them both so close together you'll most likely need a paternity test to figure out which one is the father. your doctor will be able to go over this better with you.

next time you want to have sex with multiple partners, make sure it's protected.

good luck!

Im 17 weeks and four days along. My doc says i conceived on jan 10th but the math doesn't add up. is this right?

yes, that is correct. conception date is typically 2 weeks after your LMP. if you have a 28 day schedule, you generally ovulate on the 14th day of your cycle, which is when you get pregnant.