Help?

So I have a question. I had sex 3 days ago with my boyfriend and his condom broke inside me. When he pulled out he checked the rip and said he thinks some went in me. Today, I woke up, went to the bathroom and saw I had my period. Why is that and why didn't I miss it? Once I'm done with my period will I become pregnant? ... Please help... Thanks! .... I also now am feeling big and my stomach hurts. Not cramp like feelings. Like alittle bit soreness or something, when I'm laying down I can really feel it and my back hurts kinda

[Dr. Kokil Mathur]

Hi!
Not every unprotected intercourse or 'accident' (contraceptive failure) can result in pregnancy. If this happens close to your ovulation date, then yes, you can become pregnant, otherwise not. If you had normal periods on the expected date, and so close to the intercourse, then probably, you had intercourse much after ovulation. If you had periods, then you cannot be pregnant. To become pregnant you have to try close to the ovulation date. Take care!