22 days late, neg pg tests, pelvic sono done, tech said I wasnt pg. Dr wont get tests in at least 2/3 days. Are there a lot of things it can be & wht?

Many Reasons. The list of possibilities depends on your personal/menstrual history.Whether this has happened before?Have you been on the pill?Your age?Recent stress?Change to diet?Change in amount of exercise?These can all affect the cycle. The list of possibilities ranges from the beginning of menopause to something called polycystic ovarian syndrome, and others. I recommend a thorough evaluation by your doc.
Change docs. 22 days late and not pregnant can indicate a hormone imbalance. And that warrants a workup. If your doc won't do it, find one who will!