Dates are not in sync between glow and glow nurture

Jessi 🤰

My last period's first day was at Jan 20, saturday, which according to glow, makes me 5 weeks and 2 days today. On glow nurture though, I'm 4 weeks 6 days and it has set my first day as tuesday 24th of january, which I cannot change. How can this be fixed?