Nope, mating today won't result in tomorrow's eggs being fertile. Once the shell is made, the egg is complete, fertilization can't occur in that egg anymore. It takes a few days to weeks to apply the shell (varies with species, I can't recall how long leos take). This means the egg (not the egg that's laid, but the one-celled egg from the ovary) has to be fertilized long before the finished egg (the shelled egg) sees the light of day.
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