Is it my pills?

Bri • rainbow baby boy 🌈 💙J.R.H 11/5/19 Sweet baby girl 💕J.M.H 7/18/22

So I’m 36 weeks pregnant and haven’t had any problems so far as like my stool. But today I went to the bathroom and my stool was like a brownish red color? Kinda like a leaf you see in the fall and when I wiped it wasn’t blood it was just the color the stool was. I’ve recently started on the Flintstone chewable tablets for my new prenatals cause of the iron in them since I’m not good with the pills so could that be why my stool is that color?