Pregnant on the Pill?

Hey everyone! so i've been on birth control pills for about four months now and i no longer have my period because of it (meaning i skip the placebo and just go right to a new pack.) I do have sex with my boyfriend (he's the only one i have had sex with) without condoms because I take the pill but he always pulls out anyway. I keep being really paranoid about being pregnant and i've taken three tests so far just to ease my nerves but I feel kind of bloated and my boobs have become very tender and swollen. I'm not supposed to have my period until later this month so i'm not sure if it's a sign of when i would've had my period, birth control side effects or pregnancy. Can anyone help?