So I've never been regular when it comes to my period. I've gone months without one and tons of negative pregnancy tests. Well last month it came back with a vengeance. Yet it was gone in 3 days. Then two weeks later I got it again. I've never had that happen before. I have lost one pregnancy do to preterm labor but I bleed my whole pregnancy. I'm worried I had a miscarriage. Am I just being overly concerned?