Craziness

AF is 16 days late. Last AF was Aug 26. I have regular cycles and have been TTC for a few months now. Since about a week before my missed AF ( 3 weeks ago) I have been nauseous every day usually at night and randomly through the day. Thinking of food some times makes me nauseous. This past week I've been getting headaches and yesterday I had pain in my left pelvis and today pain in my lower abdomen. Today was the worst I've ever felt. All I've been getting is BFN ' s and it's confusing. Going to Urgent care tomorrow since it's a 3 week wait for my doctor. Hoping for the best.