Uy, ganyan talaga ang dating ng ultrasound vs BPS measurements, super frustrating! A few of us moms went through the same thing, and honestly ang dating methods ay pwedeng mag-differ ng ilang weeks dahil sa how baby's growing, positioning, at accuracy ng machine mismo. Since your EDD estimates ay nag-range from Dec 17 to Jan 3, best thing talaga is to bring all these results sa OB mo and let her figure out which is most accurate based on your full picture, she'll know best kung saan talaga due mo. Good luck, sis!