Urgent Care :: Turtle eggs

[Turts4life]

Hello I have a female red eared slider turtle and a male painter turtle living in the same tank yesterday I found an egg cleaning the tank. I know females lay eggs regardless of mating however I have seen the two of them displaying mating behaviors for a while. I know she has more eggs on the way my question is if it's possible the two of them could've mated and weather there is a possibility the eggs could be fertile?

[litefoot]

Painted's can only "Procreate" with another painted. But have been known to mate ( have sex ) with other sliders like RES's. This was told to me by the head herpetologist at the nature center I use to volunteer at. But we do talk about how nature always finds a way to change that?