Take some time off work and relax.. the doctor will be able to sign you off sick! I personally wouldn’t start maternity leave yet
Have you got any annual leave remaining? If so, maybe use some of that so you don’t eat into your maternity leave. I finished work @ 30wks. Purely because I had 4 weeks leave to use but mentally and physically I could no longer go on, and I wasn’t willing to over do it / make myself unwell. You and baby are priority. A business will replace you / cope w/o you. As @Amira said make contact with your midwife. She may be able to shed some light on what’s happening, & put some additional support in place to assist with your MH @ the moment.
Have u been checked for diabetes? I think it’s a sign of diabetes but I wouldn’t worry because if they are not worried I wouldn’t be worried but I would always ask there and then to explain what that means and why they do certain tests, I would call the midwife today and ask her all the questions and hopefully she will be able to explain everything and if ur still concerned hopefully she can advice u better x