Hello
You really should ask this question in the STD expert forum at:
http://www.medhelp.org/forums/STDs/show/116
If you want statistics, that's the best place.
If you used a condom and spermicide properly, you used effective risk reduction, but there are no guarantees. But you know that. As for oral sex, it's definitely NOT safe, so you may have been exposed to some gnarly sex germs. I'd say get tested, particularly for chlamydia. Dr J