I would say very few clients have health checks on a regular basis, I can show my certificate of clean health to any lady that asks, have a basic STI check up every 3 months, and a major (bloods and all) probably once every 9 months or so, you can never be cautious enough
I know 3 months is a long time but it's a lot better than most I bet, that's only if I have no problems, if I don't feel right obviously I go straight away..