I was on the depo shot a few years back and other than weight gain and irregular periods I don't remember having any side effects. Well I went back on it two months ago and I started my first period since about three days ago. It's been abnormally light, I've hardly had any flow; and then at about one or two a.m. this morning I passed what I can only assume is a blood clot, about the size of quarter. I've never had a blood clot, but my Mom said it sounded like what she gets during some periods now that she's gotten older. Should I be concerned?