Possibly pregnant

Ty
     For years I have been avoiding pregnancy, even have my trusty sidekick IUD! But in March I decided to TTC. I went to my OB/GYN, and she suggested until I lose a little weight to hold off on TTC, so I left my IUD in. Well here's the problem....
     A few weeks ago a friend of mine came back into town we were hanging out, drinking, one thing lead to another...and need I go on. During the act the condom broke, we didn't freak. I told him I was on BC, we both had been recently tested so we didn't panic, just kept on. 
     A week after that my ex came home from deployment, I really missed him, he was looking good in his uniform, he kissed me and my clothes fell off, we didn't use protection, we never have. 
     Now according to the app my period is 3 days late. My period has NEVER been late. NASA uses my period to accurately set the date and time! I'm waiting until tomorrow morning to take a test...I'm scared. I wanted a baby just not like this 
     Had anyone else been in this situation? Am I panicking for no reason?