birthcontrol first time questions

Mrs • Inhale the future✨ exhale the past ❤💁✨

it instructs me to start birth control on a Sunday so I did and I've been taking it for 3 days and I'm three days late I feel like I'm on me period but no period.. my boobs hurt like I'm on my period I'm bloated as if I'm on it, and I'm cramping like someones snabbing me 100000xs like I usually feel on my period. I'm so confused let me know if it's normal or abdormal thanks