Low Back Pain

Hi mummies, I'm currently 14wks pregnant with my rainbow baby after an unfortunate miscarriage a few months ago. However, a sudden surge of lower back pain started couple days back. It's aggravated by prolong walking or standing. I try to rest whenever I can during working hours. I was wondering if it is common to have such pain this early in pregnancy? Also, what helps to alleviate the back pain besides resting or medication? I'm worried that it will affect my pregnancy/baby ? Appreciate any advice...