Hi Doctor, I Had Unprotected Sex Then Took Postinor 2

Hi Doctor, i had unprotected sex then took postinor 2 , a week later i had unprotected sex too but i dint bother to use any contraceptive since i was already having the withdrawal bleeding as a side effect to postinor 2 taken a week before. its now my normal period day but i havent mestrated but i have been having a crumpy mentstral feeling though i am not menstrating. Could this be an early pregnancy sign?