Fertile period

Can anyone look at this and help? So In July and August my predicted fertile window started just a few days after my period ended. This time it is predicting my ferile window starting a week later? I don’t want to miss the window because we usually start the week of ovulation and do the BD before during and after just to maximize our chances but Im afraid to wait in case the fertile window should actually be sooner than this says. I know I can track my ovulation with the test but that only covers a 2 day period of time, not the few days leading up to it.