Prenatal Recommendations

My doctor recommended I start taking prenatals to get myself healthier and ready (hopefully) for pregnancy. She said I could take any over the counter prenatals and it would be fine. Everything local has such a high dose of iron in it that I’m constantly sick/throwing up. Does anyone have recommendations for others I can take that maybe won’t make me sick? I take them at night around 7 o’clock so that I’m asleep during most of the roughest part but I stay sick til around 12 or so the following day.