Pregnant on the pill?

Kayla

My period is in 2 days, I feel bloated, been nauseous for a couple days now and felt tired and sluggish. My left nipple has just recently started to show discharge. I’ve been on birth control for 3 years and been with my boyfriend for 2. Nothing has ever happened. If I am pregnant on the pill what would be my first signs? When should I stop the pill and will it have effects on the fetus if I’ve been pregnant for awhile and didn’t know it?