Hello everyone. I have lower abdominal pain, or where the belly button…

Hello everyone. I have lower abdominal pain, or where the belly button is, horizontally I don't understand it, it has been three weeks since childbirth and it ends, I am scared, maybe this is from the fact that I've been walking all day, doing work, child and so on?! Is this not possible to be remnants? After the first child there were remnants for three weeks or four days, they cleaned me up, but I had a fever and the pains were like stronger, on Monday I can't go to the doctor, I can't leave him with anyone.