Friend doesn't understand I can't hang out

Chelsea
This pregnancy has made me very very sick! I sleep a lot and barely even hang out with my husband. I constantly feel like I have to puke and feel extremely light headed. The only time I have left the house this week was to go to the doctor. My friend keeps telling me "just get up and hang out and you'll feel better" I'm tired of explaining to her that I cant, my doctor told me if I feel tired I just need to sleep because she would rather I slept than felt nauseous. It's just getting really annoying explaining to my friend everyday that I can't hang out and I'm not doing good. I need advice