need some advice.

Sarah
Hey all. So currently, I am 16 days passed AF, I've taken 5 pregnancy tests all to be negative. I've never missed a period and I'm 29. I did have a bit of brown spotting 5 days after AF Was to come. I get really nauseas when I eat certain things, but mostly at dinner to the point where I want to vomit. I'm a little more tired than usual, but nothing else... We are ttc and I have an appointment on Jan 10 with an obgyn but I need some advice as to what is going on!