I had unprotected sex, took pill after 48 hours, exactly on 3rd may around 2AM. My periods date for this month was 19th. I don't know if it was periods or spotting, it started bleeding on 9th. The flow was very minimal that day, it was not like periods 1st day flow. The next day it was barely there and the colour of blood was brown. Today is 22, my periods date was 19. My periods have still not started. I took a pregnancy test on 20, it was negative. Am I pregnant, should I get checked or is there any possibility of getting delayed periods for this month. What should I do? Please let me know