Help!! New mommy

I literally just started my second trimester, im 13 weeks and when i girst found out i was pregnant i was 6 weeks I believe... i was taking prenatal gummy vitamins called one a day & i was doing good but a few weeks later my obgyn prescribed me new vitamins called citranatal and they make me vomit the next day, & also i get constipated. Im thinking of switching back to the gummies but I feel like thats a bad choice because they weren’t prescribed to me... is there anything i can take to help stop with the vomiting or something? Im a first time mom so I would really appreciate advice from mommies on here.