I'm 18 and 5"2 (I'm a fairly tiny person). I also haven't had any pregnancies. I have a heavy flow that lasts 10 days and I'm using super plus tampons and even wearing a pad at the same time. I've read the bad reviews and good ones and I'm questioning if I should even have Mirena inserted. I've tried birth control but there was issues with me being able to receive it and I want to see if Mirena is a better choice. Any advice?