Can any help or advice me what the matter is after taking the morning after pill

Hello guys, so i had sex on the 20th of April them i took the morning after pill 3 days later and since then i have been 13 days late and 2 days ago i started to get brown discharge and i thought of my period must be coming so then i had this 2 days and yesterday there was tiny bit of blood but now having brown discharge again? Anyone know what this is or help me