Why can't I change the week of pregnancy?

Flo calculates gestational age from the first day of your last period. If your gestational age is proven to be different, you can change it by following these steps:

1. Tap Menu ( or your avatar) > Pregnancy settings > I’m no longer pregnant > Remove pregnancy information > Remove.
2. Tap the month in the top right corner > Edit period dates > Uncheck your last period > Save.
3. Enable Pregnancy mode again.