Leaking urine or amniotic fluid?

Around 1pm today I was playing tennis (I’m 18 weeks pregnant), and I felt a trickle twice within minutes of each other. Enough to create a wet spot in that area in my light grey workout pants.

I came home, changed pants, put a pad on, sat around, finished some arm workouts. Pad was completely dry. It has now been 5 hours and I haven’t had any more leakage.

I’m also experiencing all of a sudden what could be UTI symptoms, having to pee often, feeling like it’s not all coming out, slight burning. Maybe urine leakage is because of that?

Should I be concerned of amniotic fluid leak? Or does it most likely sound like urine?