Hi - sorry I missed your question earlier. Didn't scroll down far enough.
Yes, since the meds you are taking suppress HIV replication, there is a chance that antibody production may be delayed. Oraquick guidelines state that it is conclusive at 90 days post-event, so maybe take another test.
It's tricky when you're taking this medication, so the best course of action is to talk to the doctor who prescribed it for you. They may ask you to stop taking it for a month and then re-test.