Wa'alaikumassalam! Sakit tumit ni memang common jugak during pregnancy, terutama bila perut dah membesar dan berat badan naik, the extra weight puts pressure on your heels, plus hormones loosen the ligaments which can cause plantar fasciitis. A few of my mum friends complained about the same thing, and most said it went away after delivery, but seriously kena check dengan doctor or physiotherapist just to be sure sebab pregnancy kan ada banyak changes and better safe than sorry.