Late period!!

Hello ladies

My periods are very irregular and the longest I have ever had to wait for them was 6 weeks and that happened only on one occasion when I was going through huge amount of work related stress.

The last time I had my period was October 9th. I took 2 pregnancy tests yesterday which would have been 6 weeks and one day since my last period and it was negative.

Do you know what could be going on? I’ve just turned 41.

Thanks a bunch!!