Taste changes

So I'm not sure if I'm pregnant or not yet, but I had a vvfl and then a bfn the next day and AF hasn't come. But the biggest difference I've noticed this month is my caffeine consumption. I usually require/enjoy/have to have at least two energy drinks and/or coffee. And I rarely drink water.
The past while, I haven't been able to finish one of my normal drinks without feeling slightly sick. And I've been drinking so much more water than normal! 
I know pregnancy makes your tastes changes, but does that apply to drinks and such too? Just wondering if this could be a symptom or if I'm just crazy lol