Is it possible that I’m pregnant?

Patient: It was Wednesday morning when I had unprotected sex. It’s now late Friday night, early Saturday morning. I’ve been feeling nauseous ever since yesterday morning, and my stomach has been twisting and turning all day. I was supposed to start my period, I wanna say the 4th, but I can’t say for sure because I don’t ever keep track. Anyhow, I do have slight discharge. Is it possible that I could be pregnant?

Symptoms: Nauseous, slight bleeding