The last time I had sex I got my period a day later. It was about a week and a half early and little heavier at first the normal. It ended almost a week ago, and then I noticed yesterday I started spotting. This would be around the time I normally get my period. It was pinkish brown at first but I just went to the bathroom and there was a small "piece" that came out that was pure red and bloodier. I'm not cramping or in pain or anything, and it's not as heavy as a normal period so it's not like I'm getting my period twice. (At least so far) it's just spotting.
So what could this be? Is this anything to be concerned about? I'm not on birth control, I took myself off of seasonique about 6 months ago. Thanks for all advice!