Leaking fluid or increased discharge?

Becky

How do you know the difference between leaking fluid and increased discharge? I’ve woke up this morning and just guessed that I’ve just heavy discharge but I’ve just looked in my underwear & it’s quite wet. The past week I’ve hardly had any discharge and now all of a sudden I have this? Hate posting pictures I think it’s gross🤢 but I really need to know what you think?