Could I be pregnant??

In first month of taking Alesse; took first two of pack then missed next five. I did not double up but started taking the pills again on the 2nd week. Now in 4th week of non hormonal pills. My bf and I have been having unprotected sex since the 2nd week with him cumming inside my everytime since I started taking them again.. which is the week I started taking them again. Day 3 of taking the placebo pills and still I do not have my period. I have crampping like when my period is here but no sign of blood. Last month my period came on the 9th of Dec two days before I started taking the pills. I am extremely tired a lot and I have a dull ache in my lower back. My breasts were hurting pretty frequently but are now not as sore.. only sometimes do they hurt now. Do you think I could be pregnant?? please reply.. thanks. also, if I started my period last month on the 9th would I start again on the 9th of this month or would I start now during my "hormone free week"?