if you are having PROTECTED sex then you most likely are NOT preg. but if you are worried take a home preg test.
If your period was normal that second month then it's unlikely that you are pregnant, especialy if you had protected intercourse. But if you are still unsure then go ahead and take a test. I have heard of people bleeding just like their periods during their pregnancy. Won't hurt anything to go ahead and test just to be sure. If your last intercouse was in November the test would definatly show a positive by now.