I'm 17 yr old and on 22 oct i tried having sex for the first time but dint happen. His pennies touched my vagina and entred a bit. and on 26 oct we had unprotected sex. He though dint ejculate in me he pulled out. But for a safer side I had I pill the next day. I usually have delayed periods. I had periods on 11 July and after that I had my next periods on 15 oct. How should I decide that I will be pregnant or not as my periods are already irregular. help me out.