When placed with a male the female squeaks like mad everytime he comes near her *L*. As soon as you no longer hear that or notice them sleeping comfortable with each other, ya know the deed has been done. Rarely if they get to the comfy stage has the mating not been successful, as the male will generally keep trying *L*

As for the actual 'knowing' the mating was successful. The female shows very little signs until around the last week (though some do start to get pudgy earlier, if they are pregnant you will know for sure in the last week, they just keep getting bigger until they pop (literally *L*)

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