I Was Squating Around 50KG On My Back And Looks

I was squating around 50KG on my back and looks like it jerked and i felt a sudden pain on my upper back, but i ignored that i went completing 5x5 and did not feel any pain during that. but started feeling pain in entire back next day. i took rest for a day and now its 8 days i feel little pain around my mid back at a particular spot as though someone is poking with a stick. i tough same area with my finger hard and i don't feel any pain. i can bend completely down in front without any discomfort. may i know whats going on.