When i had mc i almost thought my kidneys n rectum will burst out aswell.. I handled it well ss i always had killing period pains... But i still had to take strongest pain killers... EPAU told me if i start getting chills, fever, flu like symptoms, nausea or vomiting during anytime during miscarriage i should come to er straight away... Other than tht pains are pretty normal as u r passing tissues... If after bleeding pain is still there or u hve ny other symptoms speak to ur doctor... Take care n keep us posted...
Most likely just pain from m/c. Signs to look for with infection are things like fever or foul smelling discharge.(tmi) just keep a close eye on things. If you are still having pain in a few days I would see ur dr. I am sorry for your loss.