first time

okay, so me and my boyfriend had sex for the first time since we've been together. we didn't use a condom, but it was only for 10 seconds, if even that because we realized we needed protection. but after he got a condom we just decided to wait so we didn't end up actually having sex. he didn't cum and there was no precum that I'm aware of. could those 10 seconds (like I said, if even that) cause me to get pregnant? it might sound ridiculous, but you know how us girls get way too anxious and worried about the slightest things.

thanks!