My girlfriend has had an irregular period for sometime, but since we have been sexual active her period seems to be pretty consistent and we have been having sex without a condom for the last 2 months and i have been pulling out and she has missed her last period, she hasn't shown any signs to say that she is pregnant and i am just wondering if she is possibly pregnant...also she has an appointment to get birth control in about 2 weeks, could this cause a miscarriage?