Why is my stool black after c section

Suneeta

Dear Moms

I just had c section on 2/2/18 and I was discharged 4th day. On the 7th day when I went to the bathroom and noticed my stool was blackesh, I called the doctors office and they seemed not concerned at all, but Looking on online it said people with black stool maybe have internal bleeding, currently I am taking Motrin over the counter and iron pill 600mg total and prenatal vitamins. Just wondering any other Mom went through same thing as me. Thanks in advanavced