According to the symptoms you reported, pregnancy can not be neither confirmed nor ruled out. Try to calculate your ovulation day. Ovulation occurs fourteen days before the start of the next period. If you expected your period to start on February 23rd, then your ovulation was most probably on February 9th. Try to remember if you had intercourse on that date.
You might want to use home pregnancy urine test or visit your gynecologist to determine exactly if you are pregnant or not.