Ask your doctor for phenergan or zofran for nausea. Im also on the progesterone shots weekly. I have to stay on them til 37wks. Iv had 2 miscarriages one died at 11wks and I didn't know til I was 15wks. My second I lost at 17wks my baby was perfectly healthy I found out I have a weak cervix. Im now 12+5 the shots haven't made me sick but the progesterone capsule does sometimes. Im on 5 different prescriptions. The shot, progesterone capsule, foltx tablets, profe forte, and citranatal. Also try drinking ginger ale or gatorade. If you haven't kept anything down for 24hrs or start feeling really weak go to the er cuz you could be dehydrated which can also prevent you from keeping anything down.
Also Ive been pregnant four times now but this one is the only one that has made it this far