Change in fertile window? 🤔

Sarah-Jane • TTC 16 months💏We did it🤰🏽Sophie born 10/7/18💕
I normally have my period for 5 or 6 days then about 3 to 5 days after that my green days start but this cycle Glow has put my fertile day 1 day after AF has ended (I had a 7 day period this month)
I was wondering if that's usual? I've been tracking for 9 months now and it's never done that 😕