Am I freaking out too much

Ok , so on Sunday morning around midnight I had unprotected sex and keep in mind I wasn't on the pill .. so after that day on about Tuesday I started feeling "different " my stomach keeps growling and making all sorts of noises !! On Wednesday I craved a Burger King whopper , and so I went to buy .. today my stomach still keeps growling , I have beeen eating way more then I usually do because I think I am hungry , I also have been eating sweet flavored snacks ; ice cream, chocolate , brownies , HOT CHEETOS and lots of hot cheetos ... I typically don't eat like this & today I felt so so nauseous I decided to leave from work early on . I also have beeen overly exhausted this whole week.. My question is would it be possible to even get symptoms this soon into pregnancy ? Am I pregnant ? I really don't feel like myself which is scary , I can tell when something's going on ... My last period also begun September 1 if that helps !!!