My boyfriend and I had unprotected sex the day I ovulated 12/25. My next period was due on the 01/07. I've always had a regular period, bleeding 6-7days. I started on the 8th. On the 9th & 10th I had only light spotting. Nothing at all on the 11th. Then light spotting again on the 12th & 13th. We had unprotected sex again on the 13th. Could this be an off cycle or could I be pregnant?