Eh kembung teruk at 11 weeks is pretty normal lah, especially malam-malam, hormones and the baby growing pushing everything around! A few of my mum friends complained pasal yang sama, rasa macam perut nak burst haha. Try eat smaller meals lebih frequent, avoid foods yang gas-inducing like beans and carbonated drinks, dan jangan makan terlalu close to bedtime, tidur dengan bantal support under your belly also helps! Tapi if it's causing you serious pain or you're worried, better check with your doctor just to be sure everything's okay.