Symptoms or Reaction?

So I had my most recent period after a month of not seeing my boyfriend then I stayed with him for a week (I’m on the Nuvaring btw) and we had sex every day I was there (but from what I remember he never finished inside of me), the last day I was there I felt sick in the morning but didn’t throw up, and every morning since I felt sick today and tasted vomit but I didn’t throw up, idk if it’s because we drank so much and my body has a reaction to it after cuz my body isn’t used to it cuz sometimes it burns for a few days after also on top of the fact my eating schedule was different cuz I was there and wasn’t going to the bathroom as much (always happens when I’m there but maybe it screwed up my stomach too) but idk I have other symptoms too but I’ve had false pregnancies before (aka feeling like I’m pregnant but not being pregnant) but a bit differently and never with nausea so idk. It’s only a week after I left and I get my period in a week so idk, does it sound like I’m pregnant should I worry?