Levonorgestrel
"Got Mirena at my 6 week post-partum checkup. First baby, had him w/o an epidural, and WOW. The IUD insertion hurt worse than childbirth. I bled for 2 MONTHS straight after insertion and my husband said the cords felt like wires stabbing him for the next year. 3 years later and I wish we had money for my husband's vasectomy. I get brutal cramping almost 24/7, intercourse is painful for me if my husband thrusts too deep, I get intensely nauseous during my period and my period is VERY heavy, I recently got Pelvic Inflammatory Disease, and the cords can still be felt by my husband both the day before and the day after my period.
The only 'pluses' about this IUD is that I didn't have to pay for it and I haven't got pregnant again."