Seriously, drink your water!
Especially if you're breastfeeding. I have a lot of trouble getting enough, but yesterday it came back to bite me. I had my first appointment (baby looks great! ?), and when I went for blood work it wasn't coming out and my sugar dropped so fast. So she sent me out for lunch and lots of liquids. I came back, and she had to try my hand, didn't work, and then finally my other arm gave enough.