Itchy knees and legs

Im almost 13 weeks pregnant.My knees itch so much it starts to burn and bleed.I know if you have obstetric cholestesis it happens on the palms of your hand and foot.I had cholestesis in my previous pregnancy like at the end of my pregnancy.Im freaking out.I have blood work on July 10th.Please tell me its not what i think it is.It cant be so early on pregnancy 😭🙏