Testing: 7 day neg CT, GC, Trich. 5 month negative GC CT, negative self- dipstick

5 month symptom: Potential Discharge. Crotch watch, 1-2 small specs (eraser sized)of apparent discharge in underwear intermittent. Most days none. Never had morning discharge. Unsure what it even is if anything. One time only noticed clear fluid like precum after sitting for a while at work. Can't milk it, never see anything otherwise. Could it be urine or something else? 

1) Can discharge as a symptom start that late after exposure? 

2) Can discharge be intermittent?

What does discharge usually look like? Copious amounts? Colored? 

4) Can cpps (muscle tension) cause intermittent leakage? 

5) Would std discharge be crusty and smelly? None of that applies here. 

I am obviously very focused on this and know anxiety is driving the bus. Any other recommended testing?