Back Ping During Frnt Squats

Front squats today were going fine when suddenly, shortly after I started to ascend something went in the middle of my back - roughly in between my navel & shoulder blades - I felt a kind of ping, twitch, spasm - it’s not really that painful now (nor at the time) - now (~2hrs later)I’ve got a general ache & tightness in the area.

I’ve got an ART guy I can see but he’s only in once a week - and that’s not for 6 days, hence my post here. Any edumacated guesses on what I’ve done and what I can do between now and my next ART session?