High sex drive during pregnancy

I've never had a high sex drive. My husband and I would do it 3 times a month and that was fine. But now that I'm pregnant im ALWAYS horny. It's starting to get really upsetting. Every second of every day all I think about is sex and it's starting to become a problem. I'm starting to get depressed because I don't like thinking about sex 24 hours a day. Why is this happening and will it go away?? I'm only 12 weeks pregnant.