Prenatals

Anyone stopped taking their prenatals? I’m guilty.. I stopped about a few weeks ago.. baby is still healthy and measuring on time. I heard their not really necessary after the first trimester but I always forget to take them.. I have citranatal prescribed by my doctor.. it’s a prenatal, stool softener and it has an iron pill that comes with it also. I should definitely be taking the iron pill but I’m terrible at remembering. Should I start back is this a big issue?