You asked for an opinion you got it. Don't get all tetchy because it wasn't the answer you were looking for.
I have had a termination, my reason, I was raped after my drink was drugged, the lesson learned- don't trust anyone with your drink,not even to go to the loo, make sure you have bottled drinks and that you see the drink opened.
In your case, the lesson learned will hopefully be that birth control is not 100%, that you have to be damn careful and that condoms are a bloody good back up!