Implantation or ovulation?

I've been googling about this all day but EVERY website is acting like YOU ONLY GET PREGNANT WHEN YOURE OVULATING. BUT WE ALL KNOW THAT ISNT TRUE!! And so they are no help to me at all. According to glow I started ovulating yesterday. I had sex a week ago and 4 days ago. Huge change in appetite.  Very light brown spotting just a few drops. Horrible nasuea. I almost threw up just a minute ag and had to lie down. Maybe some of you lovely ladies can talk to me! I love discussion. thank you :)