Hi Today I Stretched In Dance Class And I Have

Hi today i stretched in dance class and i have been trying to do a split today i went farther then usual which was great for me but on my 3rd or 4th try i had to immediately stop because on the back of my left leg under my thigh area i heard a cracking sound as if my bones cracked. And now i am experiencing pain on the back, when i try to stretch my leg it doesnt let me go as down anymore i dont know if its because it's hurting or swollen i really dont know.