Last night I had oral sex with my girlfriend I had done this to her before but it was the first time she did it to me. As far as i know niether of us have had any intercoirse other than kissing with any other person. When I woke up this morning (only 4-5 hr later) I had red bumps on my penis. The bumps hurt when touched and seem to be mainly near the front base. I'm honestly kind of freaked out. Could this be an std?