Do you think im pregnant or am i just scared?

on the 11th of this month i had unpertected with my boyfriend, and every day this week i have had it. Im startin to notice im more tired than i used to be, i feel like a salty feelin in my stomach and im done gettin sick. I am havin trouble sleepin, and i have bad headaches now, feelin like i need to throw up every night and mornin. some durin the day to Am i pregnant?