Is ferrous sulfate safe to take during pregnancy in the first trimester ? And is it ok I went without taking iron for a week and a half?

I recently stopped taking my prenatal vitamin and switched to prenatal gummies that have no iron in them (so I haven’t been taking any iron for like a week and a half (I have been very tired and a lil dizzy lately) and told my doctor about it and he told to start taking iron pills (65mg) without testing my levels..

my original prenatal vitamins only had 27mg in them. I’m just worried and don’t want anything to happen to baby !