Replying to Knee Injury - should I be concerned

Seems stupid asking newschoolers but Im in between doctors right now and urgent care is pricy. Anyway I landed funky on a cork 5 today, legs gave out on impact and I caught my brakes and rag dolled a bit. My right knee feels week and it gets painful at full extension when I put weight on it and whenever theres twisting involved. Otherwise I can still walk and put pressure on it as long as I'm not at full extension. Is this just a slight sprain or could it be worse? Im relying on the experience of others here so please share anything helpful.