I'm 6 months but due in October not September WHY?

Mardeisha💕💅👑✨🌺 • 1st Time Mommy 👸🏽👶🏽👑👣 OCTOBER 9TH My Prince Will Be Born 😍☺️🙈💛
Is anyone else 22 weeks (6months) but due in October not September ? I'm confused y I just made 6 months Sunday but don't have 3 months left , technically I have 4 & I'm due early October. The doctors are set that my due date is the 9th or even before then but it's definitely in October. Why is that it doesn't add up  ?