I'm 15 years old to start with ...... last time i got my period was around dec. 16, 2009 and it ended around the 21st ....... i have had unproctected sex a few days after no worry on that day since it didnt last long .... a few days later we used a condom ....and then the days that has me worried is jan 8. 2010 he didnt injackulated in me and it only happened about 30 mins unproceted ..... an hour after it happend i got crams ...and i did the next day and the next day and then they stoped and then i got more after i ate a limon with salt a few hours later which was a week after the last ones .... and now im feeling a sharp pain which was a yesterday and today and yesterday i ate another limon and i had cramps again..... i havent had my period ...it is irregualar ...... and its already the 21th and nothing! ... i am worried!!!