What Causes Delayed Periods After First Time Intercourse?

What's wrong with me?!
I lost my virginity on dec 13, it was unprotected but my bf pulled out before he ejaculated and he had a vastectomy a couple years ago. My last period was dec 3-10, it's now January 9. My period hasn't been regular yet but should have came now or soon. I have anxiety and have been under a fair amount of stress Lately also worried about being pregnant which is next to immpoisble. For the past couple of days I've had an upset stomach which feels like a strong heartbeat sometimes, cramps, and it's making noises, diarrhea/constipation, gas, urge to pee and sometimes loss of appetite, not that I each much anyway. I play hockey almost everyday.