Am I pregnant?

My period is 7 days late, my boyfriend and I have unprotected sex but I am on birth control. I am almost complete on my first months pack, almost to the white pill. I threw up this morning. Like I woke up fine, then as I was getting ready felt light headed and hot. Threw up the onion rings I ate right before bed last night, but it’s not abnormal for me to not keep food down sometimes. Especially I ate it right before bed like that. After I threw up I felt fine and went back to normal. Am I pregnant or overthinking. It felt like I was cramping right before I threw up, like that’s how my stomach was hurting when I was light headed and hot.