What are the odds I have tetanus?

I'd like to open this by saying that I'm a complete hypochondriac, always have been.

I don't cut myself very often, but today I scraped my knuckle on a part of the sink while washing dishes. It bled a bit for about a minute while I hit it multiple times with peroxide, rubbing alcohol, and (outdated) bactine. It's about a 0.5mm long scrape. I'm not due for another booster for 2 years. I checked twice already, and the part I cut myself on isn't rusty & my hands were completely submerged in soapy water at the time.

I know I'm probably being irrational, but I can't help it.