I don't mean to indicate a 102 fever is normal for most. I get hit hard in a flare and when just blood in coming out I will hit 102 (max), and that’s very uncomfortable. Taking acetaminophen helps. If you're at 103 still you may need attention and I would suspect a virus unless you have severe pain when you press on your gut; that might be an infection in your colon which is very serious.
Hope you’re better.