My period was a week late, and then I thought it finally started right after I took a pregnancy test (which was negative). Only it hadn't started, it's only been spotting since Sunday. All I've seen on the pads is a small streak of very dark blood. I'm wondering if I should consider this a period and not worry, or if I should retest in a few days. I did recently start working out so I think that's why it's weird, but I don't want to ignore it if it's something else.