Levonorgestrel
"I have had this IUD for a few weeks. I've always struggled with weight gain W/hormones. I can't take estrogen. On the depo, I gained 30 pounds in 3 months. Then I tried the paragard, no weight gain, but excruciating pain every day for the year I had it in (suspecting an allergy), then I tried nexplanon, thinking it was less hormones, lots of people like it. Gained that same 30 pounds back, but over 8 months instead of 3 before I discontinued. I also had awful anxiety and no sex drive. That said, besides cramping, I've had zero side effects so far with lilletta. No weight gain, no anxiety, normal libido. And for those who don't know, there are several chemically different progestins. Maybe one works for you, another doesn't. DO YOUR RESEARCH."