I'd call your hospital and see about getting it checked out. I had a hind water leak similar to what you're describing. Like you I wasn't sure if I just had a lot of discharge or if it was my waters. My leak was also inconsistent, it seemed to leak when I was laying down or getting up from laying down. I also ummed and arred about getting it checked out and put it off a couple of days, but I am glad I did because there is a risk of you developing an infection so it is best to know for sure. When you go to the hospital they do a swab test on your pad to see if it is amniotic fluid or not, it's painless and pretty easy. when are you due?