What is my due date?? I'm confused

Question

The first day of my lmp was August 16. I have longer cycles and ovulated (determined by my bbt) on the 8th of September. So the app is telling me in 3w5day. Or am I 4 week5 days because you go from your lmp?

Answer

Calculating the way my doctor did for me you would be 3w4d today, but they normally aren't super accurate this early anyway.