Taste is off

I am too early to test, according to Glow I am still ovulating.... I drink a soda daily (not looking for diet/health opinions on soda). Saturday my Dr. Pepper tasted like carbonated water (like it needed more syrup). I didn't think anything of it except every soda regardless of where it's from or what kind has tasted that way since then. Clearly it's me.... I started feeling nauseous immediately after taking a couple bites of my lunch today and then again after dinner. I know they are pregnancy symptoms but if I am technically still Ovulating it's impossible to already be feeling these things right?? 
Please tell me I am not crazy. AF due on the 1st.