64 day cycle! Anyone had the same thing occur?

My last period was 16th December, I'm now on cd 64 🤨🙄 I've spoken to my doctor and explained that I haven't got my period and I've been having cramping tightenings in my 2 sides and they literally just told me to hold of 'trying to conceive' and nature should run its course.. surely to god there's something else going on for me to have such a long cycle this time.. I usually have a 38-40 day cycle?! I've took tests and as far as I can see they look negative apart from on frer on Saturday. Have no clue what to think or anything just want my period to come already, anyone else been in this situation before? Pic of the test I thought I saw something on below..