while it could be dissociation....
I think one should be cautious of what to believe though....
it could also be the beginning of dementia (not meaning to scare you...but I've heard of people getting that even in their 40s - they blank out, a lot of short term memory losses)
It could also be an affect from some type of meds.

Can you ask your partner if you had sex with him? that way you would know for sure if you did or if you are bleeding from some medical problem.

Please, try not to be scared

maybe it's not a good way to think(wonder what the T. I see would say??).... but....
dissociation is a good friend of mine...
it's helped me get through somethings I would not have been able to otherwise
it doesn't have to be scary...
as long as you aren't in danger of hurting yourself or others.
(at least that's how I view it)

best to you and hope you get it all figured out soon

fins