A temp of 100.2 isn't too much to worry about. This is a normal flu temp. The cramps could be from the pregnancy, but when you have the flu, you do tend to feel an all-over ache, and it could be coming from your stomach too.
If you are 102 over or if your symptoms persist for more than a few days, then you should call. It is safe to take Tylenol while you are pregnant and that should help with the fever.
If you aren't into OTC medications, you can take a dose of cayenne pepper to make you sweat off the temperature.