"i had unprotected sex with a friend of mine after heavy drinking ( yes, i am 24 and i know it was a very stupid move) and realized we did not use protection probably 12 hours later when we were having breakfast.  initially after taking plan b, i did not have any symptoms. 5 days later i got the plan b period which lasted 4 days.after all this stopped i thought i would be in the clear until my next period, however for the next almost 4 weeks i was nauseous, had chills, back pain and cramps. so to try to calm myself down i took a pregnancy test 3 weeks after intercourse followed by 26 days after intercourse ( both negative). 3 days ago i got my period and it was 3 days late. try to stay calm as stress plays a huge factor. i am so thankful!!!!"