Can someone help!!!

On the 23rd of December I had unprotected sex on the 24th I got the morning after pill ( plan b ) just to be safe !! On the 29th of December I started to spot until the 8th of January on the 8th my period started and then I had a normal period until the 11th and now today the 20th of January. I have anxiety and not sure if it's my anxiety that's making me feel pregnant but I have had an acne breakout, bloated stomach, urinating more frequently and backaches and some migraines.. Backache and migraines are normal for me but due to the other symptoms I am really scared. My boyfriend thinks it's all in my head and that I am safe and I'm not pregnant! I feel this way all the time it's just the anxiety though !! Can someone tell me if they've ever experienced this but haven't been pregnant or feel they are and they aren't? No hate please!!!