How do I know if I got a Tet shot?

You got it; the three diseases covered by TDaP are tet, diptheria, and pertussis (the "a" stands for "acellular" which specifies the newer type of the vaccine which uses only certain components of the pertussis bacteria instead of the whole bacterial cell). You generally need a tet booster every 10 years or so, but since you were only vaccinated in 2007, you should be good.