I've been spotting between periods for the last three- four months. I have a pretty regular period I get it for about four days every 28 days. My period is pretty heavy the first two days but it's always been that way so that doesn't bother me. My regular period ended about two weeks ago but for the last four days I've been spotting but it's kind of heavy for spotting. I usually expect it to stop by now but I'm still spotting. I don't take birth control if that matters. Should I be worried? Or is this a problem?