Hey, it's great that you're well informed but I don't think you have anything to worry about. While nothing is 100% effective except abstinence your chances of her being pregnant are extremely extremely low because you used the spermicide. While its true that pre-ejaculation MAY contain some sperm, the fact that you used spermicide before you took the condom off means it would have stayed inside her, so any sperm that may possibly have come near her in that one minute would have likely been killed off by the spermicide anyhow so good job thinking ahead. If you're really concerned (which is good because it means you're taking this seriously) and you think you may keep having sex with her suggest she go on birth control AND use a condom as that would minimize your chances of pregnancy dramatically!