If you can afford it and you have insurance you can have your doctor put you on short term disability due to "pregnancy related medical condition" I went on short term disability due to stress on 5/8 even though my maternity leave doesn't start until 5/29. I just couldn't deal with work anymor, but my doctor said he would write a note excusing me due to a "pregnancy related medical condition" your insurance can't question it. If you do go that route, just be sure you have a weeks worth of vacation because the first week you would be out of work is what is called an "elimination period" where you won't get paid by your short term disability. I hope this helps! :)
They dont.give sick leave for gestational diabetes. I have it too, found out at 19 weeks, because I had not been feeling well. They put you on a diet, give you a meter, and as long as you are eating what you are supposed to, you will feel better!