Spondy Pain, or just.. pain?

Just a tad about me -> I was diagnosed with Spondy in March (after a good long journey), and have been taking weekly anti-tnf injections (etanercept) since may.
Through June and July I was living my best life. No pain at all, long walks with my wife for the first time in a couple of years, dancing like a goof with our foster son.
In august I started getting the infrequent little pinch in my booty every once in a while, especially on walks. September my back started getting all tense. This week my hips having started hurting in bed, and today the butt pinches are very there (and not in a cute way) and beginning to get to the distracting part.

So my question is... ya'll think this is spondy? or just regular "everyone's back hurts sometimes" type pain? Or maybe it's spondy but a normal amount of pain that will probably always be there, even on anti-TNFs?

I'm not too worried, but I do catch myself getting stressed that suddenly my ant-TNFs will just lose their efficacy. My rheumatologist told me there were several forums along these lines and that it was a good idea to reach out so, voila. Here I am world.