A combination of shrimp and pineapples would probably give you bad gas at 9 weeks. It is generally easy to get bad gas while your pregnant. It is best to eat meals in small portions and ensure that the fish you eat is cooked properly.
you need to be very carefull eating seafood while pregnant. as if it is not cooked or stored properly it can give you an infecting which can lead to defects in the baby or even misscarriage. i would avoid it all together if i were you