When do I start the pill

Madi • Madi 🥰

Hey guys so I got a prescription for birth control today. My doctor said the Sunday after my period I’m supposed to start the pill. My period ended yesterday (19-25). If the pill was supposed to be started the Sunday after my period ends I would have to start it this Sunday otherwise I was supposed to start it two days ago. Would It be fine to start it tomorrow night and just skip the other 3 nights I’d say I was behind?

I got BC because of my cramps are so bad and I’m terrified I’m going to have bad cramps again, help please!!