Okay so on the 19th i took plan b after 13 hours of intercource. he didn't cm in me but i was scared of precm and he never went fully in me. Then a week later i had spotting and bleeding. My period was due the 8th of april. now its the 11th and last night when i checked i had very small bleeding, but as soon as i changed my underwear and pad, i didn't see bleeding again. pls help me tell me what this is