T-Waveless

During my Physics lab last night, we were taking our own EKGs. We compared our heartbeats with a diagram to identify the different waves. First, there is a little P-wave. Then, a little dip called Q, a spike called R, another dip called S (completing the QRS complex), and then an arc called the T wave. Apparently, I don't have a T-wave.

We looked over every heartbeat we registered, and couldn't find one. I don't know if something's wrong with me or not. Oh well...