Lower back ache, increase in libido, ENHANCED SMELL..,nausea, constipation

mood swings.... 
Mostly what I'm noticing at this moment are cramps. They don't really feel like period cramps but I've been pregnant before however only for a month and i had cramps, but they didn't feel like this either. 
I can smell everything. Like I can smell things that other people don't even notice and I usually wouldn't notice. 
It's been almost two weeks since sex, not sure when I ovulated. Could I be pregnant? Like are these good signs? 
My period isn't due soon I don't think I really don't know because I wasn't keeping track I was trying to take a break.