okay, im not sure exactly what it is your asking. are you having unprotected sex with your 16 year old girl friend? chances are thats not gonna end well, be it this cycle or the next. if she got her period a week early, that doesnt mean shes pregnant, it means she hasnt gotten pregnant in the last 3 weeks. if you're using a cyclical method of birth control, or rather only having sex when shes the least liekly to get pregnant from it, i would stop using that method at LEAST until her cycle regulates itself again. if she releases an egg a week early again, then when you think its okay to be having sex, its really her most fertile time of the month. Now if you meant your gf is a week LATE on her period, then you can start to worry about her being pregnant.
