Anyone else unsure of due date?

Ts
To me, my due date is sort of like a moving target. According to Glow, I'm due around the 15th, my OB is estimating the 19th, but found my baby measuring bigger than average at the 20th week scan. Other apps say I'm due around August 10th. Do you just stick with the date that your OB gives you? I'm around 26 weeks.