HI Thanks for posting in HCM i have understand your concern in first trimister of pregnancy hormonal changes and mostly increased HCg levels are causative factors for morning sickness associated with nausea and vomiting , some people may manifest like you your symptoms may be secondary to non ulcer dyspepsia in first trimister better to avoid almost all drugs because they ll effect the organ formation but in pregnancy omeprazole is the best drug to control gastric symptoms ayurvedic medicines safety is not proved in pregnancy , so better to avoid them.