Experience with birth control pill and iron pills?

So I recently got put back on birth control (I’ve been off it for 3-4 years) but while having my doctor put me back on them, she also suggested iron pills (specifically ferrous sulfate) for anemia. She prescribed the BC but not the iron pills, which I have over the counter. I looked up of it was safe to use together and got very mixed results. Just wondering if anyone else had experiences being on both.