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I hope for your sake that you guys never see one again but there's a good chance, especially if you've seen more than one in your house, that they are indeed there but are in the form of unhatched eggs or larva. They stay in cracks & crevices surviving off of small particles of dust, hair, dead skin cell-ewwww they give me the creeps! Yuck! Most likely you won't see them until they become adults and come out to breed and lay eggs. I haven't found any info that they are a threat to weed plants. I think they just suck a little juice from the plants for hydration so unless you had a shit ton of them they wouldn't do any real damage. It's the other stuff in your home you have to worry about if they multiply since the larva eat stuff like furniture, mattresses, clothes, any fabric. One of the best ways to fight them is to vacuum like a mad man!
Sorry if I sound like Negative Nancy lol just thought you guys should know so you have the opportunity to prevent them from spreading if they are there. As you can see from this pic they have a long life cycle & are only adults for a month or two so for up to 325 days of their life you may not see them. Good Luck!