First off, DON'T STRESS!!! Stress does weird things to our hormones that makes our periods late or not come at all so you need to relax. Have you taken a pregnancy test? If you were pregnant, you definitely wouldn't be feeling symptoms so soon so I would take a test and maybe go to the doctor's to get a blood test. But again, it might be too soon to take a test so the only thing you could do is wait for your period and DON'T STRESS
No I haven't took a test yet & I'll try my hardest to stay calm.