3 weeks pp and bruising... without bruises?

3 weeks postpartum and on the outside of each knee it feels like I have a brand new sore bruise (for 2 weeks now, no change, still same intense pain when I kneel on them) but there is no bruise. My family dr says it's normal due to hormone fluctuations, but its driving me nuts when I get on the floor for anything with my baby. For diaper changes, or floor time to even kneeling to out clothes in my dresser.

Anyone else experience this?