Eh, this is something you really should check with your doctor soon, especially since you're in your second trimester, pregnancy sometimes does funny things to our body and allergies can suddenly pop up or get worse even if you ate the same thing before! A few of us mummies have experienced sudden food sensitivities during pregnancy, and one of my friends suddenly couldn't eat prawns anymore padahal she grew up eating them every week, so it's not uncommon. Better safe than sorry lah, get it confirmed with your gynae or GP so they can advise what's safe for you and baby during these next few months.