Estimated due date

Chequitta • Wifey 💍, Mommy 💖💙 , 26 years old ♉️, Surgical Technologist! 😷🏥💉

How are you ladies calculating your due date? I have one app telling me I’m 4weeks and 4 days, another one saying I’m exactly 4 weeks and another one saying I’m 3 weeks and 6 days. 😅