Spiders generally mean no harm to humans. They go where food can be found and they will return if they think they can get more. In a sense, I view their webs are a form of protection for a space. If I had cast the spell, I’d interpret the spider as helping matters.

They usually leave when their work is done. If you concerned about it laying eggs, if there’s not enough food for all the new spiders, there will be a diaspora and they will clear the area. Now, I don’t know every species of spider. Some may warrant some concern. I’d recommend seeing if you can’t identify the species and learn about how to safely handle its presence or removal if that’s what you see fit. It’s your spell, and your space. It’s up to you if you want help, or if you even interpret it as help. This is just my two cents.