My anxiety annoys me🤦🏽‍♀️😒😕

This may sound dumb but I just need some clarification to ease my mind. I had protected sex on September 11, took a plan b two days later (I know it wasn’t necessary but I took it anyways😕) . I got my period on the 23rd ended on the 28th. I felt so relieved but I still felt paranoid for some reason. Now My boobs have been sore for the past week and my period is 6 days away (oct 21) I have heard stories that you can still be pregnant when you have your period 🤷🏽‍♀️. Could this be an early sign of pregnancy or is my anxiety getting the best of me again 🙄.

PS. I’m getting on birth control cause this is definitely not worth to worry.