Is this first sign of TMJ?

Ok I just woke up this morning and my jaw was no opening wide. Like I can put two fingers in my mouth and that is how wide it is. Yesterday my legs shoulder and hip hurt cause i was exercising in school for so long without rest. I woke up this morning and my jaw(rigtht) was kinda locked. I tried opening it slow once or twice and it worked. Do I have to face this everyday? Does some medicine work? There is no pain but when i open my jaw it make a clicking noise. I think i have tmj. But what do i do?