Hi mommy! Alam ko yan sobrang uncomfortable talaga, pero since you're 16 weeks and may ganitong pain, kailangan mo talaga magpakita sa OB mo agad para sure na okay lang you and baby, hindi dapat i-guess yan. A few of us din nag-experience ng back pain during pregnancy, pero important talaga na ma-check ng doctor kung normal pregnancy pain lang or kailangan ng intervention. Hugs, and please don't delay the check-up ha!