What kind of rash is both itchy and accompanied by a fever?
If it is also accompanied by pimples near your genitals, it's most likely herpes.
Cramping can be a sign as hormones are changing and growth of the uterus and fetus are taking place, however, the fever isn't typically a sign of pregnancy(though you can get a fever during pregnancy if you are ill.). If you have a fever, you could have some kind of illness or infection. UTI's may cause fevers and cramping as well.