Could I have ovulated early?

I swear I feel prego - For the past couple days I’ve been feeling nauseous, dizzy, faster heart rate, and a headache, and along with cramping. Could I have ovulated early and gotten prego from the 6th? I bet you I’m not, I didn’t even start feeling symptoms with my first pregnancy until around 5 weeks, but I wanted to post on here in case anyone else has had a similar experience.