Wrong pregnancy week?

Ki

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​I’m 3 weeks and 5 days pregnant (based on ovulation dates being 20th February) but this app is showing ‘5 weeks’ I have the correct cycle info in Glow, yet its incorrect.

Why is this happening :/?