I am on mirena (levonorgestrel) but my boobs and nipples are sore. I have had tissue like blood in the bathroom and a pinkish clot on top on tampon. Miscarriage?

No. Women on Mirena (levonorgestrel) are still producing hormones from the ovary. When you are premenstrual your ovary will produce a hormone called progesterone. Progesterone will can make your breast and nipple sore. Ovulation may be associated with a little bleeding. If you have had the Mirena (levonorgestrel) for sometime and you have been checked after the insertion, you are fine. No harm in doing a pregnancy test.

Related Questions

Sore breasts and nipples. Tissue like blood and pinkish clot on top of tampon. On the mirena (levonorgestrel). Took pregnancy test but came back negative?

Unclear question. Hormonal imbalances are not uncommon and may cause the symptoms you described. If the symptoms persist over more than two cycles, you may wish to see your doctor for an evaluation. Read more...