Can not having tender boobs be a symptom?!

Laura • Straight edge, vegetarian, feminist, lover of animals.
I'm about 6 DPO, and normally having super sore boobs is a tell tale sign I ovulated, however this cycle I had really bad ovulation pain so I know I ovulated, but my boobs aren't really that tender! 
This afternoon I started feeling very nauseous which again have never happened before in a cycle!
What do you ladies think? 
Could not having sore boobs be a symptom?