I am sorry to hear about your loss.
I would continue taking the AB's and maybe some pain relief if you need it. Test your temperature as if its an infection you will probably have temperature. Also with infection you often have a discharge that can be in the form of a funny AF or much lighter. Your CM may indicate there is an infection. AB's should take over 24hrs to start working. If you go to the dr tomorrow they can give you a referral for BT that will show if your white cell count is high which indicates infection. One of the risk of a uterine infection is hemorrage so I would monitor any blood loss. You can carry the baby for many weeks and still not get an infection. If there are any retained products that have caused an infection you will most likely need a D&C so probably best to go to the dr just to be sure.