Prenatal Vitamin

Looking for recommendations on Prenatal Vitamins. I accidentally missed 2-3 days of the vitamin I am currently taking, which I also took through my entire last pregnancy. But when I didn't take it those few days I felt so much better, less nauseous & sleep better at night. Not sure if it was a coincidence that I'm coming to the end of the 1st trimester and all the horrible symptoms are going away or if it was the prenatal causing the symptoms to be worse. Help!!!