Yes its normal, I experienced the same too. I think its due to the sudden blood that circulates when you start walking after lying down the entire night. And also its the weight including ours we carry too. it should go away after walking few steps and remember to elevate your legs when your resting too.
https://sg.theasianparent.com/pregnancy-concerns-swollen-feet https://sg.theasianparent.com/healthy-feet-children-pregnancy
30 weeks