Stressed out

Hey guys. I am so stressed. My period is 15 days late. Negative pregnancy test. And the last guy I was active with had a vasectomy. Last thing I need in my life right now is a child. I’m still a child myself, I only just moved into my own place, got my dream job, got myself 3 horses and a dog. I can’t handle this stress, it makes me nauseous and that makes it worse because as we all know, nausea is a symptom of pregnancy and that stresses me out more! I’m going to give myself an ulcer -.-