C Hing...
To be honest, you really need to check...
To me, it is not worth to take such risk to enjoy without condom...
Think, it will last for at most 10 minutes for doing that "Final step", but the risk may last for your whole life...
My simple calculation cannot match in both sides.
So, even you are safe this time, really do not try it next time.
If no condom and you really wants, you can either ask her for HJ or even Oral (comparative more safe.).
Good luck...