Hi Yes,  pineapple is not allowed in the early stages of pregnancy and later on..they say.. And other fruits such as papaya, grapes along with pineapple are too not allowed..in the early stages and during pregnancy.. An enzyme called BROMELAIN present in pineapple may breakdown protein when consumed in pregnancy leading to any abnormal bleeding thus leading unusual contractions and early labor..

Hi There are few fruits which you have to avoid during early stage off pregnancy like Papaya, grapes. yes of course pineapple they contain certain enzymes that alters the texture of cervix which could induce premature contractions. Hope this is helpful.