Since about 13 weeks pregnant, I have gotten sick sporadically. It first started out a lot, and then went to about once to twice a week. Around 23-28 weeks, I didn't get sick at all, and now I am 32 1/2 weeks and get sick about once every week to week and a half. I have taken Pepcid AC and it helps to subside it, but doesn't relieve it completely.  There are even times that I only get 20 seconds in between feeling sick and actually getting sick so it's not even enough time to take anything.