After having my baby last summer I went back on the Pill. However, it's caused a cervical erosion (I had this once before) and my GP has advised I come off it because the hormones obviously don't agree with me. Last time I came off the Pill I got pregnant (basically we didn't use a condom). However, I don't want to get pregnant again for a while (we're about to move house) so I need something reliable. My GP says the Mirena coil is great. But a friend has just told me it can cause weight gain / lack of sex drive. Does it?