Can't say specifically (don't recall over the counter pregnancy tests then, but I wasn't looking for them either!) Wouldn't surprise me to be a color change test , given the changes in testing (simplification for the user, etc.) over time.

I must admit given the era I also thought AIDs as soon as they showed his deterioration this episode…I remember young, smart, talented people dying all too quickly then…Tonight this show breaks my heart of the thought of someone having more to give, but being taken too soon.