ermmm i just went to BKK end of last month at 22 weeks pregnant..
i didnt get bitten by any mosquitoes at all..
but i did spray insect repellent on myself everyday..
foodwise, i avoided eating at roadside stalls, only went to restaurants at shopping malls..
their tap water is not portable so i drank mineral water only (which is the same case even if i wasn't pregnant)
i stocked up a lot of boots milk storage bags while i was there..