Airsickness? or pregnancy?

So I flew 3 1/2 hours yesterday morning, (Dec 22nd) And got super nauseated on the flight. A while after I landed, I was still feeling sick, and when we went out for dinner I had to run to the bathroom upon seeing sushi and threw up. I thought I felt better afterwards, but every time I've eaten food since then I can't keep it down and will throw it up immediately. I have never felt motion sickness in my whole life, so I don't really know if this is it or not. Has anyone else every experienced this? I just threw up 2 almonds that I ate two or three hours ago, that's how weird my stomach is right now. I would like to somehow rule out pregnancy.. If possible 😬 I just had my period about a week ago, and I had unprotected sex once shortly after it was over, but he pulled out before he could come inside me. (This isn't a common occurrence, we usually use condoms.) Im also getting headaches and cold sweats.