My husband and I have been having unprotected sex for the last few weeks trying to get pregnant. About 5 days ago, I had a brown sort of discharge, which I thought might be the start of my period. The next day there was nothing. The next day I had a very light spotting, then the next day nothing. The next day I had what I thought was the start of my period, but now I'm getting nothing again. Should I take a pregnancy test? Normally my periods are like clockwork.