Oh boy, hope it’s not hip , but unfortunately could be . I had similar groin pain a few years back ,recovering from sciatica , so went to doctor thinking I had pulled my groin. The doctor took xrays and found out my groin was ok, but turns out my hip was breaking down. The X-ray wouldn’t have shown a groin problem , but doc suspected right out of gate ,possible hip. Anyway I definitely had to do knees first , so now they are done ( right knee just 2 weeks old), I may have to consider following up with hips . Hope you have better knees if your groin doesn’t heal , and you too have to look into hip problems.