Itchy everywhere

I am so itchy at night! I'm 12 weeks pregnant. I'm itchy everywhere. Especially around my vagina. Not in it or anything-not a yeast infection. It's only at night. I go to the gym, eat dinner and shower. As soon as I put pjs on and get on the couch, the itchy begins. I deal with it until I can't take another min, then I take a tub, and I'm usually fine after. What the heck. I don't think it's serious because it's only at night but it's so weird. I'm going to call the doc today...