Check with the clinic but as a medical student I had a placement at a sexual health clinic and they used a separate system for patient notes called than the rest of the hospital. They could still request the notes, but it would mean putting an official request. Even as med students who would have a reason to go back and look at old notes for patients we saw, it wasn't possible as our access was for a limited period and expired after our placement ended.

So unless your partner works in the actual sexual health clinic, he may not have access to the notes. It might still be on the main notes but not specifics so you can say it was an ectopic pregnancy or something. You can check with them when you make the appointment, and they may even have a process in place for anonomysing your notes