Aww mama, 31 weeks pa lang so may time pa talaga! A few of us moms tried doing pelvic tilts, hands-and-knees positions, and staying active, walking helps a lot, kaya try mo yun for a few weeks pa before mag-worry. But honestly, best to mention this to your OB sa next checkup para makita niya in person at magbigay ng specific exercises na safe for you, kasi bawat baby at pregnancy talaga ang iba. Fingers crossed babawi si baby soon, but you're still very much in the normal timeframe!