How to approach the topic..

Just wondering how you ladies would approach the topic of wanting to stop work with your OB. I've been miserable and don't know how I can last 3 weeks. I don't want to flat out ask for a Dr's note to get out of my job, but I also want to be healthy for my baby. Dealing with high BP, swelling, exhaustion, etc. I have hypertension but he hasn't ever mentioned my work being an issue or needing bed rest.