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[boa]

I doubt you have a gravid female at the moment, you may have seen some mating but a bit early for being gravid.
Maternal incubation is fine and as has been said is actually more 'reliable' under captive conditions as the heat is more uniform and involves less work for the female to keep the temperature optimum.
Using an incubator is 'better' for the female as she can regain her condition more quickly but you can counter that with the chances of electrical failure.
It is swings and roundabouts, both have pros and cons.