Wanting to get Pregnant

Katt

okay so... just to make my long story short. I have been trying to get pregnant almost all year now. And every time I try to get pregnant my period stops coming. Last time I tried to get pregnant was in July and I have not got a period since. Anyone know why? I have gone to the doctors when this happened the beginning of the year and they said that everything is okay... can anyone explain to me why this is happening?