They are called discovery until you find out what you are discovered for

I joined discovery health on my partners company group medical aid, I was told that my Pregnancy will not be covered due to me joining whilst I was still pregnant, my question is when I was still working I joined my company medical aid but they covered the costs even though I was 7 months pregnant. I even had one of the client service people telling me to activate my Pregnancy programme so that my Pregnancy can be covered. When I ask why they keep saying they will ask underwriting