Gone from 28 day cycle to 35 TTC #1

Luna

So, I had Mirena for two years (April 2016/March 2019) and the first two periods after removal were exactly 28 days with O on the 14th day... this month I am now on CD35 and NOTHING with a high possibility ovulation happened on 3rd July ... I’ve never been this late and all tests BFN. Has this happened to anyone? Any advice?? Thank you xx