Anybody else forget to take vitamins often?

I'm really bad at taking them. I take an iron supplement since I'm anemic but that's the only vitamin I'm religious about. My iron levels get really low without it. But I skip my prenatals for a few days sometimes. Mostly because I forget but also because the iron alone makes me really constipated. Baby is healthy. I'm almost 27 weeks and haven't had any complications thus far. I think I eat a decently rounded diet so I get nutrients that way. Does anyone else have a hard time taking their vitamins?