Swelling?

Lena

I'm 31 weeks. I just went to my doctor's today and everything is fine with baby. But tonight my husband was rubbing my feet and I don't have swelling that I can see. But when he pushed his fingers into my leg bone the skin went down and it didn't go back up like normal, it left kinda like a dent.. I never had this that I noticed.. what is going on.. it doesn't happen anywhere else, just where the leg bone is..