Chances of me being pregnant?

I started my last period on December 9th and ended December 13. I started ortho tri cyclen lo on December 15th. I had unprotected sex on December 21 and I was supposed to ovulate on December 22. From the 15th-21st I took seven pills right on time. Do you think there's a chance I could be pregnant? I'm supposed to start AF on February 4th or 5th and I guess I have normal PMS symptoms but I can't tell if they're pregnancy symptoms or PMS symptoms. Help lol