How do i tell if im leaking fluid?

This probably sounds dumb.. but how do i know the difference between leaking fluid or if its just pee.

I notice my undies are regularly wet, and sometimes it has no smell.. sometimes it smells like pee.

I rarely notice anything dribbling out.

I want to ask my midwife because i understand the risk of infection if it is fluid.. but il be super embarresed if its just me leaking pee.

I haven't lost my mucus plug.