Positive Pregnancy Test 3 weeks after D&C

Please no negative comments......

Long story short, I found out at 9 weeks that the baby had no heartbeat and was only measuring 7 weeks and 4 days. I had a D&C 4 days later. My doctor told me he was able to get all the tissue from my uterus. I only bled for 2 days after my D&C and my doctor also told me I was able to have sex whenever I felt good enough and when the bleeding had stopped. So 3 days later, me and my hubby did the deed and multiple times the remainder of the week. So its been 3 weeks since my D&C and almost 5 weeks since my HCG would of started decreasing. My doctor doesn’t know what my HCG would of been bc he didn’t test for it bc he knew I was miscarrying so there was no point.

I’m assuming that the positive pregnancy test I took is leftover HCG but now I’m curious if I could really be pregnant already bc my doctor told me I could be extremely fertile within days of having my D&C. I plan on testing again in a week to see if the line is lighter.

Has anybody ever ended up actually being pregnant if your experience is similar to mine?

Thanks for taking the time to read and respond!