I took myself off birth control about two months ago and have been using condoms every since. My husband and I went camping and forgot the condoms so had unprotected sex two days in a row but pulled out both times. I was suppose to start my period 3 days after this. I started out with brown discharge the next day after our encounter and lasted about 3 days. Then it turned in to red and a regular period. The first day was heavy and then the second day slowed right down and by the 3rd day is pretty much gone. By the 4th and 5th day I started spotting brown again. So was this my period or could I be pregnant? Also my periods have always lasted 5-7 days, and usually I never ever get cramps but this time I did. I have also have had really bad headaches and bad back aches off and on and just not feeling well. I have had brown spotting before but it never lasts 3 days and then comes back after the bleeding.