Confused about ovulation days

So to me it looks like it's saying there is quite a long fertile period because you have quite long cycles so it is guessing your fertile period based on an average cycle then extending it as your cycle is longer. Are your cycles usually around 35 days? Ovulation is around 14 days before your period, so the 5 days before that and the day after are fertile days.

@Tanya my periods were every 4 weeks exactly then the one between April and May were far apart. Went to a&e because I was bleeding MASSIVE clots and they said it wasn’t a miscarriage because a pregnancy test was negative so before the last cycle they were regular and just the last wasn’t x

Ah ok that has probably just thrown it off. It's hard to know when you'll ovulate as not sure if your cycle is back to normal or not. I would start to BD every other day from now to make sure you catch ovulation time.

Basically because it has no idea when your exact fertile window will actually be. Try not to off of apps as they are always a guess, not accurate x