I have nothing against mediums/clairvoyants, but I think this kind of activity should be just for fun, and you shouldn't really take it seriously.
I seriously doubt that this person is right every time. She hasn't met you and is just giving you her predictions by e-mail, probably based on information that you gave her.
so this time I paid 8.00 for her to tell me if all would be okay
Why would you pay anybody to tell you it would all be okay? That's a little bit crazy! You should keep your money and send me an e-mail and I'll write back and tell you it's gonna be okay if you want!!
The fact that she predicted a girl, adamantly and now she's telling you it's a boy should make you think twice about the quality of the information she's giving.
The only way you can find out the sex of your baby is to wait for an ultrasound, and then wait until the baby is born. Pretty much every method other than that is a waste of your money and most likely a con.
Sorry to be so negative, but I think you're being taken for a ride, in my humble opinion.