Am I getting enough prental vitamins from Natalcare Glosstabs?

My doctor prescribed Natalcare Glosstabs becuase I wanted some prenatal vitamins without Gelatin. As far as I remember she recommended taking one vitamin everyday, I am four months pregnant now and I am seeing a new doctor instead of that doctor. My concern is that the size of those vitamins are really small, so am I getting enough Vitamins? I couldn't find what are the vitamins and supplements in that brand, as when I get 'em from drug store it doesn't have any label stating what's in it. I am really concerned now, can you please help me?