Wa'alaikum assalam! Sakit tumit masa pregnant tu common lah, sebab weight gain and hormones make everything sore, a few of my mum friends complained pasal ni jugak. Best lah check dengan doctor just to be sure it's nothing serious, tapi usually it's just the extra pressure on your feet. Meanwhile, try pakai comfy shoes, reduce standing time kalau boleh, and maybe soak your feet in warm water, memang relieve sikit! Take care of yourself, okay