Yes - latex allergy is a possibility, although rare.

Unfortunately most of the mainstream pharmacy brands of lubricant do contain chemicals which should not go near your vagina or cervix. There is a brand called Sylk which is supposed to be natural and made from kiwi - avail from most phamacies.
Otherwise you may be better off just using a gentle essential oil such as jojoba.
(Ask at your nearest health food store - they may have natural options).

Taking a probiotic supplement (avail from the fridge of health food stores) will keep the thrush away, as will eating an alkaline diet.

HTH.

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