Hi am 18 years old and i been having unprocted sex for the last 2 months.I always had irregular periods.My last period was on July 29,and on August my period never came,and i didn't have sex on that month.On Sept.2 i had sex unprocted,i took a pregnancy test on Oct.1 and it came out negetive.So i had sex again in Oct.2,but i dont know if i took the pregnancy test too ealry but i dont think i did.Since i had sex like 3 days after my breast started to hurt a lot,and i been having cramps like if my period had to come but it doesn't.I dont know if i could have some other promblem with my health that its causing my period to be late.I want to know if someone has experience something like this,and what could i have?