I wouldn't think very likely with the spermicide making contact with any precum, if there even was any precum. However, if it's causing you stress to think you're pregnant, go get a Plan B now. Its $40, but I've been in a situation where I more than likely couldn't have gotten pregnant, but I figured it was worth it over the anxiety I was feeling, plus $40 is cheaper than an abortion and definitely cheaper than a baby.
Nothing will happen to you. Don't panic.