With imported guppies they do get mixed around and when you are buying females from an aquatic outlet and the tank is labled female guppies the chance of them already being pregnant is high. because the can carry eggs for months on end. :)
Just signed up think this is a good fourum loads of info and stuff i work at big blue aquatics in poulton le fylde wich is close to blackpool so if anyone want some prices on tank set ups or fish im your man ! :good: