iron supplements

so i’m 16 weeks pregnant and the doctor put me on iron pills since my iron is low. today was my first day taking them and i threw it up 30 minutes after taking it and i’ve felt nauseous and tired all day. i’ve literally been in bed since 5:30pm and can’t find motivation to get up. i just feel like crap. i hadn’t thrown up in a few weeks and i don’t know if i threw up and felt like crap because of the pill or just pregnancy. anyone else have common experiences with iron pills? i’ll try again tomorrow and see if it goes the same way