[ON] Getting an iron transfusion next week. Did anyone experience any side effects?

Edit to title: iron infusion***

Hi there, I am currently pregnant 30+4! I’ve been scheduled for an iron transfusion since my ferritin was at 15, and my body was not tolerating OTC iron pills (upset stomach, vomiting, severe constipation). I’ve never had an iron transfusion before, and it’s mostly out of curiosity on whether there were any symptoms post-infusion? Did you feel better immediately as well?

TIA!