Funky cycle caused by thoughts?

This is the first month I’ve tracked my cycle, and it’s also the longest cycle I’ve had for years, CD46!! Lots of people have been saying it’s probably my over thinking that has caused my cycle to go off track, does anyone else think this has happened?? All pregnancy tests are BFN. I’m booked to the Dr tomorrow for an ultrasound to see if they can see what’s happening. The later my period is, the more stressed I’m getting!!