Me and my boyfriend had sexual intercourse. He did it RAW for about 30~60secs, then he put on a condom, and we finished the job in another maybe 10 minutes or so. What is the risk of me getting pregnant?

Me and my boyfriend are finally ready to have "an evening to ourselves." How do we make sure the condom is going to be unrolled on him the right way, since we don't wanna put it on wrong and waste money for what we bought.