My dog is having bowel and urinary incontinence after being spayed; is this a bad complication, or normal?

15 week old terrier mix; she had her spay 2 days ago. Since then, every time I take her out to pee or poo (which she has been going), she will then go again within 15-20 minuets of having come back in. Is this a normal reaction to surgery, or a complication? If it is the urinary spay incontinence problem, is that treatable (I've been getting some mixed info on that one)?