If it’s worse on a morning it could also be your sacroiliac joint, a common problem with cyclists caused by tight quads and hamstrings pulling the pelvis out of alignment. Falling onto the hip will also cause sacroiliac problems, very common amongst goalkeepers. As others have said, you really need a proper diagnosis from a physio or sport therapist.
I suffered badly from this last year, could barely walk for a couple of days. GP originally thought I had a cracked pelvis (I fall off a lot) but x ray ruled it out. A sport therapist was able to diagnose the sacroiliac problem.
Now on a daily stretching and core exercise regime, so far no re-occurrence.