I Injured My Right Leg 3 Weeks Ago While I

I injured my right leg 3 weeks ago while i was stretching doing the splits. when ever i try to spread my legs i sometimes hear a pop but always feel pain in my right hip flexor, hip bone and thigh bone. Right now im playing goal through the pain when ever im playing in net I cant extend my right leg as far as i know i can . what is wrong and what can i do to fix it?