Itchy Wrist

Amanda • Pregnant with our first - due August 2015!
I'm 13.4 and I just started having a really itchy wrist this morning. It's lasted all day long and it's driving me bonkers. I don't have a rash. It's only on my left inner wrist. I can't find much online other than OC, but I read that it is too early for it to be that. Thanks in advance!