I ate LOTS of nuts and peanut butter in my first pregnancy - and the child (almost adult now) has severe nut allergy and has to carry adrenaline. (nut allergy discovered at 8 months old).
(This pregnancy was before the government advised anything about nuts in pregnancy and when camillosan nipple cream still contained peanut oil).
I have avoided nuts in subsequent pregnancies - and have no idea if those children have an allergy or not as our house is now a nut-free zone - and I even advised the school those children must not come into contact with nuts. (which means bringing own party food on special occasions and missing some activities - like making fat balls for birds!)
I did ask the GP about getting the other children tested based on eldest childs severe allergy but he doesn't want to. Thinks I should just give them nuts to eat and see (no thanks!).