31 weeks and flying & discharge. HELP

My doctor approved me to fly and i went to california. Now i'm here and i'm leaving tomorrow. I woke up with more discharge than usual and when i stood up i felt a big gas bubble drop. i've been very paranoid this whole pregnancy and now i'm very scared. I knownit could just be digestion since i haven't been drinking much water or eating much other than granola bars since i've been sick. I'm very scared please help. also been hearing water sounds from my higher abdomen