I had unprotected intercourse the night before my period was suppose to begin and both nights after it was due. I have a 31 day cycle and I have always gotten my period regularly. I am a week late and yesterday, I developed light brown spotting with slight cramps, like I'm about to start. Should I wait a few more days to see if the spotting stops? I have never had brown spotting before a period, and I'm not too sure on what to do.