As said older bengals have trouble with birthing and looking after them, 7 months old is like a 5 month old child for a bengal
She may die giving birth or not look after them, why didnt you just neuter them from 12weeks of age? Are they related? Both boys got her, poor thing
if she is calling then thank god it hasnt taken hold and she can be neutered now, her nipples arent pink and she is calling means she isnt in kitten, if you want to know get the vet to scan her before he neutered her and use a different vet, NO need to wait this long, why sint she booked in 3 weeks ago? Or this monday?? and vets not doing it for a month?! Sounds crazy! There are 5 vets in my small town alone surely there are others near you? She needs to be done ASAP, no questioning it really!