Before I stopped my birth control pills, I took it regularly everyday. I stopped taking the pills the day after I had unprotected sex with my boyfriend. I had 12 left in a pack.. The last day I took a pill was October 25 & my last day was suppose to be November 6. I'm really concerned because on October 27-31st I had gotten my period for the second time that month. & now I haven't gotten it at all. I've been having cramps, headaches, and all the symptoms I usually have when my period is supposed to come. But I still havent gotten it yet.. Does this mean I can be pregnant or is it just a side effect from stopping the pills? Should I just go back to taking them again?