I need some help! Please tell me what this might be?

This could be many things. A lot of women get fibrous, benign tumors in their uterus as they age, or if they are on the pill. I operated on a woman who had almost six of them in there. While they are not cancerous, they can cause infertility. However, it could also be a calcification of some kind, which needs to be checked out immedietly. Go to the ER and explain your issues. Better to be safe than sorry.