Positive pregnancy & ovulation test 2 weeks after D&C??

I had a D&C for a missed miscarriage 2 weeks ago. This morning my husband finished inside me (unplanned) and just for interests sake I took a OTK. 
The OTK came up positive so I took a HPT just too see if I still had a HCG level. It came up positive too...
I know that when HCG is still present you can get a positive OTK from that but I have read that some women have gotten pregnant with these test results... Anyone heard of this or experienced this????