Ay, ganyan talaga ang feeling towards the end, sobrang uncomfortable! A few of us moms experienced the same thing around 36-37 weeks, and honestly, it could be your body preparing na for labor, the pain you had on Nov 25 when they found you're already 1cm, that's a good sign. Try pelvic tilts, warm compress sa likod, or just change positions every 30 mins, sitting, then standing, then lying on your side, kasi ang staying in one position lang ang nagpapahusay ng sakit. But since you're already having consistent pain and you're so close to your due date, I'd really suggest you text or call your OB right away para ma-check if there's progression, kasi baka ito na talaga ang early labor signs at they need to monitor you na.