Trying to get pregnant

Im judy geronimo villaruel. Im 38 yrs old..My problem is me and my husband are trying to get pregnant again if ever. Because my first child is now 7yrs old. So i want to have a baby again he is a boy and i want a girl in my second if ever i get pregnant again. But sad to say weve trying for almost a year but nothing happen. Pls could you help me what im gonna do? Tnx☺