Worry

So on Tuesday March 6 I had unprotected sex with a guy who I was dating. He didn’t cum in me so I didn’t think much of it. That same week on Thursday I went to the gynecologist for birth control.(This is the first time I’m going into birth control) I didn’t start the birth control until Sunday March 11. Since I started taking it I felt a little more fatigue and dizziness every once in a while. Like if I’m laying down and I turn I will feel really dizzy it doesn’t happen every time. I’m not sure if it’s side affects from the pill or maybe I might be pregnant (fingers crossed I’m over reacting). If anyone can help that would be helpful also the birth control I’m taking is Lo Loestrin Fe