@Kelly I currently use the app flo I’ve used that since before I had my little boy, ever since I’ve had him my cycle has been between 30/32 days x
Flo is alright. I used that when trying to get pregnant. I mean it's just a calculator taking averages of your cycle but if you have a shorter or longer luteal phase than average it will always be wrong which is why it's good to learn your body's own signs
Yes if you ovulate late in your cycle. If you aren't it might be worth paying more attention to vaginal discharge and cervix location through the month to give you a better idea of when you actually ovulate. I would also use a period tracker app though if you don't neatly fit in the 28 day calendar it can take several months to get the right rhythm for you