Sayang, kalau ada sakit perut dan cecair pelik macam ni, you need to see a doctor or go to clinic/emergency asap okay , jangan tunggu. Boleh jadi banyak perkara, tak boleh teka-teka. A few of my mum friends yang experience something similar, doktor je yang tahu apa sebabnya. Please go get checked out, better safe than sorry kan, especially kalau involving your body macam ni. Jangan delay ye!