Anyone have bad knee’s after pregnancy?

My little girl is 3 months old and ever since I’ve had her I’ve had extremely bad knees more so when bending, or walking up over the stairs or even going to sit on the toilet! I was a smaller girl and I put on a total of 35lbs and I did work a job where it consisted of a lot of bending and stocking. I don’t have a doctor appt till next month and was wondering if anyone experienced the same?