Period and clotting...

Jillian
Within the last year my period has changed. It is very light day 1. Day 2 and 3 is so heavy and I have large clots(sorry if tmi). Sometimes I'll soak through my product 3 times in one hour. My period will then continue for 3 more days where it is light and will be on and off. I won't bleed for hours so I think it's done and then boom its back on. Does anyone else have this problem? Trickle, flood with large clots and then on and off again? If not do you think this is normal? I also had a miscarriage during this year. Could my period be trying to tell me something even though my Dr has checked me and says everything looks fine? I'm so confused!