Is it all in my head?

Erica
We've been TTC for awhile now... Our son is a fertility baby and while I went through treatments last year, my body did not react well to them, so we stopped. 
I lost 55lbs and have been hoping to get pregnant naturally. According to GLOW, we hit the nail on the head as far as my peak days. 
It will be 2 weeks on Friday since we had intercourse. For a few days now, I have had severe fatigue (which I'm typically a ball of energy), last night I had a food aversion to eggs (one of my favorite foods), and I've had some mild CM. I also get some nausea in the afternoons and when I work out but that could be because of a prescription I am taking. Things are just off. 
Is it all in my head or could I be pregnant!?