2 year old was playing and bent his leg in an abnormal way, instant crying. What to do?

It’s been a few hours now, and there’s some swelling in the area, he won’t put any weight on it, and starts crying all over again if there’s significant movement in the area.

Husband thinks it may just be a strained muscle & we should wait it out. My initial though was that it should be x-rayed, so I called the pediatrician, but they were booked, so I was referred to another clinic, which is also packed. The only other option at this point is the children’s ER.

I don’t want to overreact, but I also don’t want to leave my lil guy suffering.

What would you do?