thank you for posting your query in healthcaremagic.com... vomiting and nausea in pregnancy is generally common in the first trimester and gradually reduces in the later part...now its treatment is more or less the following- take small frequent meals take multivitamin tablets take meclizine or dimenhydrate tablets for vomiting, some physicians prescribe ondansetran also also, feronia d3 contains iron supplement and it is better to take it in empty stomach...take your calcium tablet or antacids etc at 2-3hour gap with the iron tablet.... hope this was helpful.... regards