Hi all, I was just wondering has anyone else been in this position?

I have been off on BC since mid-end of April and have had 3 periods all between 30-32 days long. I am now on cycle day 39 and AF was due last weds. Glow amended my ovulation day to the 15th from I think it was between 7-10th Aug so would have been due (based on new of date and 12 days I have been between ovulation and period for last 3 months) 27th Aug so am 8 days late based on cycle but possibly 4 days based on ovulation is that correct? I have tried normal stick tests, clear blue (not digital) and first response all are negative and starting to lose hope. Has anyone else been in this boat before?

Thank you and baby dust to all xxx