Watery discharge??

Hi ladies! Since Sunday I've had excessive watery discharge like pee my pants amount of discharge. I've literally changed undies two-three times a day. I went to the doctor and they took a sample of it- did an ultrasound and the baby's sac is nice and full so they do not think its a fluid leak....but they also haven't given me any other answers? 
Anyone else have something similar? 😩 I'm ten weeks btw