A week late but not pregnant ?!

Amy

Before I had my son (15months ago) I had irregular cycles. However since then I’ve had a 35 day cycle. We have been ttc #2 for 5 months now. This month I’m a week late. I’m not pregnant, every test is a bfn. At what point do I start worrying something is wrong? I just want af to hurry up so we can try again next month. I’d love to hear your experiences, all advice is welcome xx