Help and advice please ladies❤️

Hi there, so on December 5th I had sex. I am on birth control and we used a condom. We had a couple of drinks but i’m pretty sure the condom DID NOT break, and I don’t even think he fully cummed. My period started about 3 days after we had sex as expected, but here I am on December 27th and i’m feeling extremely tired and my boobs hurt slightly. I am kinda stressed about it, do you ladies think i’m just freaking myself out or???