Hi mama! Yan usually just urine stains lang talaga, especially pag matagal kang hindi umiiwas sa cr, lalo na ngayong pregnant ka pa, ang pressure sa bladder mo ay sobrang dami na! But since you're at 27 weeks, mas safe pa rin na i-mention ito sa OB mo next visit kasi sometimes may slight discharge changes din during pregnancy na worth checking, just to be sure lahat's good with baby. At least pag nakauwi ka at nakapag-rest, nakikita mo na wala na, so that's actually a good sign, stay hydrated lang and try to pee regularly whenever you can, okay?