HIV..Been Tested 4 times..now what?

Hello! I had unprotected back in beginning to mid December, with a co-worker who's status is unknown to me. He did not inside me. I was tested first week of January, last week of March, first week of April, and on June 5. All were negative. I tested through Planned Parenthood, with the rapid test. They said it is very accurate since it tests for the antibodies. They also told me that i would need to come back exactly at the six month mark, and that the last test was not conclusive..is that correct? Do I still need another test? Thanks!