Yes, they need to ovulate to become gravid. I believe, (and may well be wrong) that ovulation is the act of moving the ovum to the fertalization chamber (so to speak). After which the fertalized ovum will spread through out the body for gestation.

Timing is a harder one to pin point IMO, cuz i have read reports of Boa retaining sperm. I know of one such case where a boa bacame gravid after 23 months of not being with a male.
Whether or not she can become gravid after ovulation in the same season, I do not know.

Hope that helps some.
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Richard Carew
Sunset BCI
You laugh at me cuz I'm different! I laugh at you cuz you're all the same.
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