Losing hair?!?!!

So I’m about 26 weeks with twins and stumbled upon a small but significant bald spot. Wondering if this is normal or if I should be contacting someone about it? My doctor has been telling me to take an iron supplement but I eat a lot of dairy so I’ve just recently found a time of day that has been working for me, but would that be causing it?

I don’t have gestational diabetes( already been tested) and my diet hasn’t been the best these last two weeks so I’m wondering if it’s just a diet change and an iron supplement fix?

Has anyone else had this? What did it wind up being?