Purple, I have (I think) recovered memories of csa from age 13 to 14 in the past year of being in therapy. I'm 39 too.
At first I felt my t didn't believe me too. She says now hat she does and always has but tbh it was a bit rocky to begin with. I didn't believe me either, and still have lots of questions, but when I 'allow' myself to think its true, something very tense and held feels a bit freer.

I think my T didn't believe me initially because I was trying to find a way through different memories...and almost saying some memories to see if they felt true when I said them if that makes sense, and getting confused...also I didn't believe it myself and didn't want to believe it so she may have picked up on that...and because a t has to be so incredibly careful that at no point can a client turn round and say 'T you said I was abused, you put these thoughts in my head'. It's so risky and controversial.

I had a few fragments which I hadn't thought of for years, it felt irrelevant, but when I looked back here fragments didn't make sense, eg
Trigger

Of him making me watch porn

That didn't fit in if something bad hadn't happened.
Purple, do look through my old threads if you want, I started some almost exactly the same as yours. Maybe look for a new T as well, you deserve to have support from someone who can honour and hold your experience.
Red xxx