Working and Pregnant

Keopu • 30-something communications professional mom of 1, looking forward to being mom of 2 in September!
Anyone have trouble working while pregnant? I don't have a highly physical job but it is pretty high stress and high output. I'm always so tired that it takes me 2-3 times longer to do anything. Then on days like today I just want to take the rest of the day off because I feel so nauseous. Anyone have any tricks to get through the day in a productive day?