Is this bad for me?

I’m 7 months postpartum & I’m still taking my prenatal vitamins. I got into a habit of taking them, so they just became a part of my daily routine. The biggest reason for taking them is because I hemorrhaged after birth losing half my blood & got a blood transfusion. It only brought my blood levels up enough to consider me “stable” but still very anemic. The doctor told me to take iron pills & stool softeners. I did that for about 3 months & noticed I kept getting dizzy after taking them. I stopped taking them & just continued taking my prenatal vitamins because they have a lower dose of iron & they haven’t made me feel weird. My idea was that I’d still be getting what I needed just in a lower dose. Is this dangerous or harmful at all?