I had my miscarriage on December 22 and my D&C on the 23rd. My period came about 5 weeks later and was heavier than normal. Mine lasted longer than my usual period too. To give you an idea of the heaviness...I usually wear a regular tampon throughout the first 3 days of my period then a light tampon for a couple days after. My last period which was my first on since the miscarriage was different....regular tampon the first day then a super tampon for the next 3 days. I had to change it every 3 hours. It was super heavy. Then it lightened up after those three days were over. Everyone is different so I am simply telling you what happened to me. My doctor told me to expect a heavier period for the first one.