What Do I Do?!

So I'm supposed to start taking my birth control the Sunday after my period starts but I just started and it's 11:30 at night on a Sunday. I don't want to take the medicine now because I'm not going to be able to continue taking them at 11:30 plus I haven't eaten all day and I don't want to take them on an empty stomach. So should I start next Sunday or just go ahead and take the Monday pill tomorrow? Or am I completely screwed this month and have to wait until next month? Idk what to do, someone help me!