Cycle length

My cycle has been irregular and I’m trying to conceive. The last 7 months it has been:

25 days

30 days

28 days

28 days

27 days

34 days

26 days

Can anyone give any advice about this? Right now my period is never coming on the days that are predicted by this app so I’m not sure my ovulation days will be right. I know I can use the ovulation tests and track bbt but can anyone advise how long my cycle is on average and if there is anything that will be done to regulate it and advice on falling pregnant with this cycle.

Sorry I realise this probably doesn’t make much sense!