I had sex with my husband during my last period. A couple of days later I stop and 4 days later I started again. I've read other concerns, but they all refer to using the morning after pill. I haven't used any type of birth control for over 3 years. Another person talked about a cyst, but my bleeding doesn't look anything that was described. It looks like the start of a regular period. Could this be a sign of a pregnancy, a cyst or my body aborting?