I LOVE my Mirena. So do ALL of my friends. My best friend got one and talked me into trying it, then I told another friend and another and another, they told all of their friends and we are all now LOVING our birth control. The truth is, it is a little uncomfortable to have placed, you might get a cramp in your uterus for a 1/2 hour or so. Then you will spot for up to 90 days. It will be like a very mild period with really light cramping occasionally. I would plan to wear pantiliners for 60 -90 days. Then, this is the best part, it just stops, no more spotting, no more cramps. I have had mine for almost 2 years now and have had my period approximately every 90-100 days and it only last a day, if that. I don;t have any cramping so I never know when it's coming, but literally, I know this is personal, I can wipe, notice some spotting, put on a pantiliner and by the evening, it's gone. I can't feel it at all. I am VERY sensitive to hormones, and I don't notice the small amount of hormones that are in it. I didn't gain weight, I think I actually lost weight. The best part is, it is VERY reversible. Anytime you want to get pregnant, you can have it removed and get pregnant within 60 days for most people. I admit, I'm a little nervius about whether or not it will hurt to have it removed, but i guess 5 years of protection ought to cost me a few minutes of discomfort. Good Luck choosing something that will work well for you. PS. Everyone I know hated the copper IUD, they said it caused extreme cramping and is more of an "abortive" type of contraceptive, where the Mirena actually prevents both pregnancy and implantation.