Hi. I noticed today that my waste pipe in basement is slowly leaking when I flushed the toilet. It also leaked a little when the washer drained into the utility sink (sits right next to the pipe). My plumber can't look at it until tomorrow night and I'm a little afraid to flush the toilet or drain water for fear that it will get much worse. Could this be a localized problem or symptomatic of a clog in the line? I'm assuming since the utility sink draining made it drip (the pipe is below the leak area) must mean it's backed up?
Link to image of the pipe area leaking: http://beautifulboxcar.com/deanna/pipe2.jpeg
Any insight would be greatly appreciated. My house was built in the 50s and I'm a single woman who has owned it for a year.