Hello, Thanks for sharing your health concern with us. Vomiting and tiredness is usually observed during early pregnancy. It can also be a side effect of ingestion of folic acid. The composition of the two preparations is different in that the latter contains methyl folate, which is considered ideal to ensure better bio-availability. Please go ahead with the medication as suggested by your consultant. You may also ask for preparations to curtail vomiting. Please make sure you get enough rest, proper hydration and frequent small easily digestible meals. Hope this helps.