ummm...Hollywood... what if it is her time of the month? Then you're going to have to "get to know her better".
I have similar concerns like you as I am getting married next July IA, but I've known my fiance for 2 years. I am hoping he doesn't have the same friends as you.
I'm not in any rush to have sex with her yaar...its not like it's going to be my first time or whatever. I have no problems waiting, whether its 'that time' of the month or not -- I would have no issues with waiting as long as it takes...I just wanted to ensure I wasnt screwing up due to the fact that everyone has their own interpretation of what is required on the religious side...my friends obviously have their own interpretation which they are pretty consistent with...ie all 4 of my cloest friends gave the same advice!
In a way, its my fault...If I knew more about my own religion I probably wouldnt even be asking the question to begin with.