Pregnant or Coincidence?

Denise
I'm 22 trying for my first child. I ovulated may 23 had sex the same day. For 3 days I have been tired and nauseous, 2 of the days I actually vomited around the same time. It started off as a cough to something that stunk, then I vomited. It's still to early to test because af is due Saturday. Could I be pregnant or just coincidence?