Left knee crack/pop coming out of bottom of squat
I am about 2 months into SS. Prior to SS I was doing a random exercises, one of which was weighted lunges. I started getting patellar soreness in my left knee because of poor form during the lunges, so I stopped doing them. Then I started doing SS so I never went back to the lunges. I've been foam rolling my entire quad, ITB, and hamstrings before each workout and I haven't had any issues in any part of my leg/knee since starting strength.
As I said I am about 2 months into SS. Two days ago I squatted 180 with no problem. Today I moved up to 185. In the first set, during 3rd rep, coming out of bottom of the squat, I leaned forward a bit and felt pain in left knee and some sort of inaudible, light pop/crack. I finished the 4th and 5th rep without pop, but felt more pain. (I should have stopped before the 4th rep in hindsight). The pain went away during the rest period and I massaged my knee a bit and things seemed fine, but then when I tested bending my knee with no weight, I felt a sharp pain (worse than during the squat). Of course, I skipped rest of the squat sets, and have avoided bending my knee in the hours since. I've also been icing my knee as well. Now I can bend my knee and there isn't pain, but I'm still being gentle with it.
So my question is, what should I do going forward. Based on my description above, I guess it's safe to say it was caused by my shifting my weight forward coming out of the bottom of the squat and putting too much stress on the knee?
I'm guessing there shouldn't be long term damage? Should an ice pack tonight, and walking around gently for the next few days be enough to have it heal?
How long should I wait before squatting again? And when I do try to squat again, what weight should I do?
Thanks!