18 wks & still throwing up

Sara
I'm 18 weeks on Wednesday and have been taking Diclegis since about 7 weeks. I take 2 pills at night (not the full 4 pills allowed per day). As long as I have my medicine and snack throughout the day, I am fine. But today I randomly threw up again despite that. Anyone have similar experience? I was hoping to start coming off the medicine soon but at this rate that doesn't seem likely.