need medical advice!!!!

I hyperextended me knee back in september. There was also a sprain to my MCL. there was a huge pop when it happened. I was fully healed after a few months. At soccer tryouts two days ago, I was running and I think (I don't really remember) that my leg was behind me and there was a huge pop. Someone else had heard it, it was that loud. It's swollen up but I can walk on it the day after which I couldn't the first time. I have a little pain on the right side of my knee cap (meniscus) but other than that just soreness. There's no bruising around my knee either. It's basically the same symptoms as the fist time. I was also walking (more like hobbling lol) down the stairs and I bent to far back or forward and it was more mobile than before. I can almost completely straighten my leg but I can't bend it back farther than about 105 degrees. What are the chances my ACL is torn? Couldn't  I have just sprained it again because it wasn't strong enough? My mom thinks I push my body too hard for being out of shape and that's why it happened. Please help. I have doctors appointment Monday but need opinions.