Well, i think it's early to determine if you are pregnant
To be honest, i felt like you once and was sure I'm pregnant but unfortunately my period came out :(
So, just wait your period date and see or you can do blood test 2 or 3 days before its date
Gd luck
My late period was Jan 12. And intercourse was january 27,25,21,18
You didn't mention last period date nor intercourse date, so it could be pregnancy and could be sickness only
Mention them, so somebody can be helpful