I am 33 yes old. My tubes were cut tied and burnt. I am 11 weeks late. I have a uti being treated with bactrim. My breast feel full and painful.???? My Dr that done my procedure says I can't be pregnant. Could I really be?

Strongly doubt it. Lots of things can cause periods to be late. Having a uti and being treated for it, is a good reason that this occurred. If your next period is late too, talk to your doctor about it and follow his plan.