Talk to Orthopedic Surgeon on Knee Carcking Sound

I'm a 30-year-old woman with a 2-year-old child who has recently stopped breastfeeding. I’ve noticed that my knees make a cracking sound, both of them, especially when I pray or stand up from a low position. I saw a doctor who advised me to take calcium and vitamin D supplements. I drink milk, eat well, and have a relatively inactive lifestyle. I'm concerned that this could be the start of arthritis. I want to plan my family and am worried about becoming a knee patient since I have just one baby. Can you guide me on how to prevent this condition?