Ay mama, normal lang yan sa late pregnancy, ang back pain at pelvic pressure ay super common na, lalo na ngayong malapit ka na! White discharge din ay okay, basta walang foul smell or unusual color, so wag mag-overthink hehe. But since you're at 37 weeks na, definitely mention all of this sa OB mo next visit para sa peace of mind mo, lalo na kung first time mo, kailangan mo ng reassurance from someone who can examine you. You got this, mama! Sending love and prayers for your safe delivery too