HELP (No Condom)

Ashley
I had sex with a guy on the 6th of this month. Which is 4 days after my fertile window was over. I'm supposed to start tomorrow, but have no symptoms of it happening. I'm super scared. This guy didn't rape me by any means, but he did kind of force me into it. When should I start freaking out about being pregnant? What are the chances of me being pregnant?