Ghost Period?

So I've been having all of my normal period symptoms the past few days, but have not had any bleeding yet, even though I normally bleed very heavily. I was supposed to start 2 days ago. I heard that this is called a "Ghost period"? I had a major concussion a week ago and I heard that can really mess up periods. My boyfriend and I are very careful and usually use a condom and he pulls out, but even without the condom he pulls out really early. We didn't have any unprotected sex during my ovulation. Should I be worried about being pregnant? I really don't think I am. Just paranoid and messed up in my brain because of swelling 😅

What do you guys think?