Are anti-human immunodeficiency virus antigen-antibody testing able to detect both antibodies and antigens?

Hi doctor,

I had a protected relationship with a girl but there was strong unprotected oral sex. I inserted my fingers into the her vagina for two minutes or more. This was the first time in my life that I had sex. There was a panic attack and I also started to fear human immuno deficiency virus. I did anti human immunodeficiency virus antigen - antibody test after fifty days and also did a second test after 100 days. Do these tests check for both antibodies and antigen, or only the antigen. According to what I have read that the protein 24 antigen disappears four weeks after infection.

If they actually search only for the antigen, are these tests useless? Please advice.