I’m scared

I believe that I ovulated sometime last week . My husband and I did the BD last week as well. For the past few days I’ve been very dizzy and have had bouts of nausea. I was very dizzy all night and this morning it’s very bad. I’m also nauseous and am having trouble eating. Is it possible to have pregnancy symptoms so early? I haven’t even missed my period yet. I’ve never experienced anything like this.