22 days late? 56 day cycle

At this point, I’m quite convinced that I am having either a cryptic or ectopic pregnancy! I have taken multiple test AFTER my missed period (all a few weeks apart), and all of them were negative! Yet I’ve been feeling slightly nauseous, having throw up/acid in my throat, sore nipples but not breasts, my cycles are always between 31-36 days (and 44 at most, if it runs a bit late but that hasn’t happened since January) it’s all so confusing and I’m extremely worried and stressed out! Has this happened to anyone else and they weren’t a pregnant?