At 8w1d we found out that our baby had passed away, possibly weeks earlier, but I had not experienced a miscarriage. My scan was a bit different to yours though because I had a pregnancy sac measuring 8 weeks and a placenta. My obs told me that the placenta can continue making pregnancy hormones for quite a while after the baby has died, and therefore my body hadn't realised that something had gone devastatingly wrong. I could have waited for my body to realise and miscarry naturally, but my morning sickness was really really bad, so I had a D&C.

I think that in your case you should definitely seek more advice from a doctor. It doesn't seem right that you would get +ve results on a hpt and then not experience a miscarriage after so long, or have AF return. I'd be stressing to the doctor that you want answers because it must be so hard for you not knowing what your body is doing for so long.

I hope you get all the answers and that AF returns for you soon so that you can get back to TTC if that is what you want to do.