If you have had unprotected sexual intercourse during the days of your fertile period, it is possible that you could be pregnant.
Your symptoms do occur in early pregnancy
but it can be otherwise too. It is too early to comment on your pregnancy status now. Please wait for your periods until next week. If your periods are delayed, then do a simple urine pregnancy test at home to rule out pregnancy.
Hope this helps you.
Meanwhile, drink plenty of fluids and take adequate rest.
Get well soon.