I had unprotected sex but my partner did not ejaculate in my vigina afraid that he might pre-ejaculate I took 3 minigynon30 pills and my period don't come as yet I'm wondering if it change my period cycle

Yes you could be pregnant and yes that can effect your cycle. Wait about another two week and take a HPT with first urine of the morning

You could possibly be pregnant. Get checked by a doctor, and if you are so worried about getting pregnant, please use protection, not to mention the risks of getting a sexually transmitted disease.

Sometimes that can happen ,I remember having unproted sex and thinkinking I would get pregnant but didn't you aren't pregnant