Hi, my last period was on the 13th of August and lasted 6 days, my next period was supposed to be due on the 12th of September but instead I was 3 days late. My period has been heavy, I've been peeing frequently, my lower back hurts, before my period started my breasts were sore but I haven't had any cramps during this period and I usually do. And I'm much more emotional than I usually am. My boyfriend and I had sex a couple of times after my last period and before this period was due. Is there a possible chance of being pregnant?