Missed Period what’s going on!

I have been tracking my fertility for years and have 1 healthy child so I’m not new to the process. I have never in my life been more than 2 days late for my period.

I got a positive LH on day 9 so I assume ovulation on day 10/11 so I should of got my period 14 days later around cycle day 24/25. Well I took a pregnancy test on day 26 and super negative, and I’m now on day 29 and still no period! That puts me at 4/5 days late. I’m wondering what happened…? Did I not actually ovulate even though I got a positive LH, and if not when would my next ovulation or period come? I’ve never had a cycle like this before.