Where's AF??

So I feel like for the past 4 weeks I've been playing an epic game of where's Waldo... I'm usually very regular but I've nearly skipped two periods! AF didn't come in December and still hasn't come in January. I had a blood test done the first of this month and it was BFN. CM has been all over the place... from lotiony, to EGW, to more watery. There's been an abundance and my underwear are never just dry!! I have no idea what my body is doing but I wish she would get her act together!!! I've also started bleeding just a tiny bit after sex. It's not much and it doesn't last long and it doesn't happen every time. I just don't know what's going on!