Have you taken a pregnancy test? I can't help but think you are pregnant. Go get one of those tests (you can get some store-branders that are just as accurate as name-brand) that have more than one in there and take them.
Are you alone or something and afraid? I hope not, but if you are you can email me and we can talk.
I wish you the best, and hope you find out exactly. I had a friend who went through the same thing and took one of my tests. She was really upset at first, but now her daughter will be 5 this year and she cannot imagine her life without her.
Take care!