Nah, don't worry it's probably nothing, maybe just the men in the white coats in the resident evil movie that are watching you down for observation since the water coming to your house is infected with the t-virus. They're probably waiting for your own cells to comepletely bond with the virus and then they will take you to their HQ's in Racoon City and use you like a lab rat.
or it could also be nothing watever.