Uy momsh, yan ay normal talaga sa late pregnancy, yung ligaments mo nag-sstretch at baby mo nag-eengage na sa pelvis, kaya may weird sensations talaga like that! A few of us preggy friends namin had the same experience around that time, parang may sharp pains or pressure na biglang lumilitaw tapos mawawala. But just to be safe, better mention it sa OB mo next check-up para ma-confirm na lahat ok lang, lalo na may 4 weeks pa before due date mo, okay?