Hi, Am Alittle Bit Worried. I Had Unprotected Sex On

Hi, am alittle bit worried. i had unprotected sex on Saturday night n sunday morning. i took postinor 2 pills at 2pm sunday afternoon. i was expecting my periods around 23rd May or 30th May since i had not started ovulating. So its been a week since i took the pills. I have had abdominal pains during that week esp on wednesday to friday since i walk alot during deliveries to my customers. on Sunday i had the same abdominal pain its like am cramping. Now i dont understand could i be pregnant of its just delay of periods. Coz so far i dont have any symptoms of pregnancy.
Kindly help me out here.