Bulldogs World

I had my bulldog spayed last week and every time I take her out she pees like 5 times each time and then pees on the carpet. I took her back to the vet and they put her on clavamox which she has been taking since Tuesday night. she  still pees like 5 times each time.  I couldn't get enough urine for them to send away. They did a dip stick test and its didn't show a UTI or blood in her urine. I have to get more urine for them to send away. Has this happen to anybody else? Is this normal after spaying? She didn't have this problem before I took her to be spayed.