Late period???

Blair

Ok so I’m like on my 5th (I think? Or 4th) month on birth control, and I’m 6 days late on my period, and like, i took a pregnancy test and it came back negative, is this normal? Because I’m only 18 and I’m terrified right now 😩 I have sex a lot with my boyfriend but we always wear a condom and pull out too, so like ???????