It helps me to hint around the edges at first, or send questions in an e-mail....so my therapist can bring up at session and if I don't feel ready to talk, it's okay, but at least it's out there. Not sure if your therapist accepts e-mail.
Another option would be to continue working on your basic stuff in therapy, grounding and other skills, and trust with your therapist. And pieces might fall together. I always had negative memories of molesting dolls and sticking fingers into friends and having them do that back to me. Eventually I brought that up (in e-mail) and that alone does not mean sexual abuse, though it could be some attempt at control for other reasons (medical trauma, physical abuse, etc), since it was a bit beyond the normal realm of exploration for the age. Other pieces came in nightmares, snapshot images of touching adult body parts, and body memories of people sticking things inside me when "asleep" or passed out. But even after 3 years I don't think I could say exactly what happened to me.
It doesn't help me to try to figure it out. I'm working on a lot of daily living skills, grounding, safety, evening finding ways to tolerate good feelings and feeling happy. And sleep. This other stuff just comes up, if it will, after a lot of resources are in place and trust with the therapist is pretty good. I was sexually assaulted as a teen, and remember most of that...so it's confusing to know what memories come from where, but based on earlier behavior and the tone of some memories I often suspect earlier abuse too. I just don't expect perfect memories any time soon...it's just not the goal of my therapy.
But if you feel like you can find a way to ask your therapist, you might get some other ideas on how it could work...and even just lessen some of the shame or confusion you might be carrying, just by sharing, even if it doesn't help you directly connect to memories.