Tarrot cards?? how true are they?

my mum went and had her tarrot cards read yesterday, she was very tight liped and didnt let anything slip, she mentioned my mum new someone knew somenoe who was having a baby (mum said nothing) and she said this would be a very happy event, my mum said if you can see the of the child not to tell her as me and my partner dont want to find out. however half our later the lady let slip as she did not realise she was talking about the same child and said ' i see you have a granddaughter' (there are no other grandkids in my family. mum was not going to tell me but i asked her too as i want to see if she is correct (at the birth obviously) however ive been longing for a girl so this has really excited me, has anyone had there cards read and had accurate info, or am i getting excited for no reason??