Help with iron dosage for anemia

I was just diagnosed with anemia (37w) and my doctor called me and said to start taking an iron supplement. So I went to the drug store and picked one up. I’m wondering since I haven’t been taking my prenatal in a while if I should take that along with the iron supplement? The iron in my prenatal is only 28mg and the iron in the supplement I just got is 65mg. So together it would be 93mg. Online I am reading 50-120mg is sufficient for pregnant women with low iron levels. Does this sound rite to those who have anemia? Just wanting to double check because I didn’t even ask my doctor how much I should take, she just said to take a supplement immediately.