Naseouse after sex..

Hello ladies, so Sunday morning me and my SO had sex a little after we woke up. It was hot and sweaty sex I was very tired afterwords and when I got up to shower when we were done I got up and felt a little weak and very nauseous.. has that ever happen to any of y'all or could that be a sign I'm pregnant? I'm on cycle day 27 and I took clomid this cycle.