I think that it is more possible that the second one is the father.
I may be the dull gal in the bunch here, but if you had protected sex with guy 1 and unprotected with guy 2, is the confusion coming from your due date? Because docs often go by the date of your last period until you have your sonograms. Did the condom break?
It sounds like the doctor simply went from the first day of your last period, which gives you the August 29 due date on the conception calculator I used. On a person with normal ovulation, the conception period would be December 2-10 for that due date and first day of LMP. Problem is, if the November 30 guy's sperm reached you, it could certainly live for a few days in your system, and then it would be within the December 2-10 window, along with the other guy. So you're down to whether you think the first guy's condom was effective or the second guy came or not. (You're not sure if he pulled out? Oh, dear.)
Anyway, I'm sorry but it's too close to call, since both guys were within five days all within the fertile range for that month. You're going to need a DNA test when the baby is born. I'm sorry you're in this situation.