Fluid Or Discharge

A
How would I really be able to tell the difference between leaking fluid or it being just discharge? I for real have to wear multiple liners throughout the day cause if it gets on my underwear, I have to change them after a while. It's not a whole bunch at once, but enough to leave a noticibly little wet mark. It seems to leave a little yellow color on the pad, it's like a light yellow. It's easy to see on my white undies. But it doesn't always leave a color. I can't call my office yet and I'm not tryna freak myself out to go to the ER yet. 29W