Im done with my period but i feel light headed,nauseous a sharp pain on my side could i be pregnant ?

I HAD UNPROTECTED SEX TOOK NEXT CHOICE 30 MIN LATER SET MY ALARM 12 HOURS FROM THE TIME I TOOK PILL 1TOOK THE SECOUND PILL... A WEEK LATER I GOT MY PERIOD SEEM NORMAL AS MY OTHER PERIODS BUT DIS MONTH I STARTED FEELING SICK..LIGHT HEADED WASENT REALY EATIN WELL BECAUSE I WAS WORRY AND THINKING WHAT IF I WAS PREGNANT BUT THEN AT THE SAME TIME I FELT NAUSEOUS SOMETHING I'VE NEVER FELT BEFORE IN MY LAST MONTHS I WAS THINKING IT COULD OF BEEN THE PILL MAKING ME FEEL SICK BUT AGAIN IS BEEN 2 WEEKS SEENS I TOOK IT...MY PERIOD IS OVER....I'M STILL HAVING THIS PERGNANT SYMPTOMS COULD I BE PREGNANT I'M REALY WORRY ANY ADVICE WILL HELP...