Allergic to Pregnancy

In addition to being hungry and queasy at the exact same time, I've become incredibly itchy these past few days. Little itchy on my face and legs, but especially around my armpits where I've developed a nasty red, raised rash. A friend says maybe my body chemistry has changed and I'm now allergic to my deodorant or soap (which I've been using for years). Whatever it is, it sucks.