I know, I know. But wouldn't you desperately want to leave some sort of a heritage if you already know your life is going to be cruelly cut short by disease at mere 200 or so?
Saavik being pregnant would shed some light on the pon farr thing, ruling out at least one possibility: that it's related to the female fertility cycle somehow. Odds would be heavily against Saavik being capable of bearing children at the time young Spock gets unbearably horny if that really were the case.
OTOH, do Vulcan women even get pregnant? Spock grew up with blood that's incompatible with Amanda's - perhaps the Vulcan Way does not include a placenta at all, and the child just sort of floats around inside the mother's womb like a marsupial would inside the pouch, eating through its own mouth and breathing through its own lungs, both of which develop very differently from their human equivalents in the early stages. A kid like that could be dumped on any willing "helping pouch", except perhaps in the case of poor pouchless Amanda...
Timo Saloniemi