I took pregnacare for the first few months, it was fine but made me throw up horrendously, i only noticed how much worse it was making my morning sickness when i forgot to take the pills and felt better, then when i took them again i literally vomited for 6hrs, after this happened a couple of times (i am BAD at taking pills) i stopped taking them all together, i just felt they werent right for me because if my body had needed all those extra vitamins, it wouldnt have spent half the day throwing them up!
I will start taking iron if i feel i need it, but i love orange juice and eat red meat quite often so am finding my poo is quite iron -y anyway
trust your body is my theory