I Used Primolute To Prevent Pregnancy Then I Had Sex.

i used primolute to prevent pregnancy then i had sex. i was 3 days late for my period so i took cytotec and bleed for only 2hours.
i will like to know if my late period meant i was pregnant and if so how come i bleed for just two hours.
Its been days now and my nipples are sore but i dont feel any other signs of pregnancy