Venus is very close to the just set Sun at the moment. Perhaps you saw Jupiter if it was higher up?
Mars rises in the east about 1:30 am at the moment. The star Antares (anti-mars) is very orangish, bright and directly overhead at midnight too, easy to confuse the two (not saying you did btw).
Check the beginners forum for free planetarium software or try this site
http://www.fourmilab.ch/yoursky/ to see a labelled sky map on the night in question.