Watery white discharge, no period, and 3 days late

So I'm just wondering if anyone has had this happen to them... I am three days late (almost 4) and I feel slight cramps like I am about to get my period but it never comes. Instead of blood I just have watery kind of white discharge maybe a little small tiny baby hint of yellow too.

It keeps kind of gushing out and I keep thinking it's my period but isn't. My underwear has been wet all day....

But I took three tests and all are negative (granted I'm using dollar store tests).

Just wondering is this normal or has anyone been pregnant with the same symptoms?