Feel like I'm pregnant but I have af...

I'm nauseated off and on, couldn't even think of food yesterday, one of my favorite things just tasted different and certainly not as good, headaches,  fatigue and just a total lack of concentration. I felt a bunch of these before when I was newly pregnant with #1/#2. But here's the kicker, I'm in the ending day or two of af! Normally I cramp or whatever and that's about it... Could I just be sick, coming down with the flu or something?