Sakit punggung sebelah dalam tu memang common masa pregnant, especially when you're walking banyak or getting up from sitting, a few of us pregnant mums kena ni jugak! Tapi sebab ni first baby, better check dengan doctor just to rule out anything, especially if the pain is getting worse or ada symptoms lain. In the meantime, try to rest with proper support, maybe guna pregnancy pillow, dan jangan berdiri lama-lama kat satu tempat je.