Pain starting several days after D&C?

PumpkinC
Had my D&C on Black Friday at just shy of 10 weeks pregnant.  Felt tired and a little sore over the weekend but the worst part by far was the emotional pain.
Now it's 3 days later on Monday and I have headache, lower back ache, cramps around uterus ranging from dull ache to sharp twinges, and a bit of ache radiating down the tops of my thighs.
Took a Percocet two hours ago that has not dulled the pain.
Has this type of delayed pain response (several days later) happened to anyone else?  Did it turn out to be normal or infection?