I will say yes: in 2014 I conceived a spiritual (not human or physical) Child with a major demonic King. I carried the spirit pregnancy in my energy body, and then gave birth to the spirit out of my navel chakra, it was a whole big deal.
Anyway.
After the spirit had left my own energy body, I read through all kinds of things I’d written, because at that time a lot of my working life was also text-based, e-mails & stuff, and it didn’t feel as though I had written them - it felt like reading an imposter who was using my accounts, and mimicking my writing, but not, actually, me.
It was profoundly eerie!
So I think I was definitely increasingly possessed by the Child as it gestated, and that this accounted for that strange dislocating feeling afterwards. I should add I’m not diagnosed with any disorders of reality, not on any meds, or drugs, and I don’t even drink unless there’s a specific ritual reason.
(I don’t share my Child’s information at this time, and am not really interested in doing more than mentioning it happened, and they’re fine, out there being their own demon, and so am I. )