It's pretty much standard operating procedure to check the oil level of a car when the engine is hot. If you're leaking oil you're not going to see the result of the leak on the dipstick unless it's a really bad leak. The best way to see if you have an oil leak is to look under the car.
I was messing around with the Check Control on a test drive car. It hadn't been driven, it had just been started. When I went to the oil level indicator there was a little animated clock indicating that I need to wait to see the accurate oil level in the car.