If you were my mother or sister, I'd tell you to please see an OBGYN immediately, so I'm asking you as a friend. You're right, there is a possibility it's not that serious, but you won't know for sure until you get it checked out. Please let me know.
Peace and Love,
I too thought I had a fibroid and managed to live with it for over a year, but it had grown so large that I opted for removal, which I am glad I did as it turned out to be a tumor. You should go to your Doctor and ask him to do an ultra sound to see if they can at least determine if it is a fibriod and then have it removed.