Hi Tony and welcome!
First off, comets will only move very slowly, if you can detect movement in a comet naked eye it means it will be very close to us and will be one of the biggest news stories around! Secondly they are "fuzzy".
Most likely the ISS (International Space Station). There was a pass that was visible here in Colac and was nice and bright ( mag -2.6 I think!) but it was at 8pm not 7pm.
You can check ISS passes and lots of other info on satellites, comets etc here
www.heavens-above.com
Cheers
Malcolm