Yesterday Whilst Gardening I Was Squatting Down And My Knee

Yesterday whilst gardening I was squatting down and my knee locked and I couldn't get up so managed to sit down and after 5 minutes was able to straighten my knee and get up. It also happened in bed this morning but managed to straighten leg out quite quickly. On both occasions I could feel something pop. I do jive dancing twice a week, should I not do this? Do I need to see a doctor or just rest it? I am nearly 65.