I agree, call your university health services and/or your nursing school admin office (I'm sure they've had lots of these questions, especially recently). The titer may not be free, but shouldn't...
I was born in 1979, had my first MMR vaccination was in 1980 and a second in 1990. I kind of assume that your 1989 vaccination was probably another MMR and not just Measles, but I may be wrong. If...