I always keep on track with my period's schedule. A week before my period I always get this signs like pimples coming out, soreness of breast, headaches and etc. However, the week  i was expecting my period, but it didn't happen, so My boyfriend and I had sex then he came inside me. Is there a possibility I could get pregnant. 

*i missed my period last year as well, thought I was pregnant but not, it just came sooo late. Maybe I have irregular period