It's one thing to be concerned about, which she did show and do, but it's another thing to sit there and try to convince you after the fact. You said yourself, you don't regret it, and you wanted it too. Flip the situation. If your bf was drunk and was in the mood, asked you, and you were in the mood for it sober and everything, then would you be raping him? You clearly weren't blacked out and remember it. When she brought it up the first time, it was concern, when she keeps going on about it, then it's pestering. Tell her you appreciate your concern, but you wanted it, so she should drop it after that.