Frustrated

Ok so my periods have forever been irregular, and before you ask I was a virgin up to about three months ago. So I never kept track of periods until now. Me and my boyfriend lately have not been using condoms but we used the "pull out" method and he's been successful each time BUT I missed my period of this month and it is now 15 days late and I've taken 3 tests and all were negative, I have not had sensitive breasts,no cramps, no spotting. And I don't know about fatigue cause I've been working 40 hours at work lately for the past two weeks, but I do get a little bloated and to be honest I'm a little backed up. PLEASE PLEASE help me anyone.