Hello I'm Lucero, & i'm only 18, i'm really scared because 2 and a half months ago i had sex with my boyfriend, (we used condoms) and then my period wouldn't come for 3 weeks. Then i got it but for only one day. And now it's been another month and I still haven't gotten my period, i was supposed to get it about 3 weeks ago. I've taken tests and They've all said negatives. I'm wondering why haven't i gotten my period yet? The only symptoms i'm having is the back pains, getting really tired quickly, & peeing a lot. Today i realized my breast have grown a little. Could someone please explain to me what's happening to me :( also I'm a vegetarian so I don't eat meat if that helps...