Hi so my cycle is usually 27 days, and pretty darn regular as well. Today I'm 14 days late, I tested a week ago and last night, both negative, but I've got tender breasts, headaches, nausea, bloating and I've been feeling off for a while now - not in a way I can really explain, apart from feeling strange. In a week and a half it'll be two periods that I've missed, what's going on?