Hmm here is the advice that I can give you that my doctor gave me and his name is Dr. Jabara at UMC medical center and he is a fertility specialist. He said before you become pregnant, work on your diet. Excercise regularly, not vigorously, and eat healthy. The healthier you are the healthier vessel you will be for you child and this is suppose to make things happen a little easier.
I heard all wives tales like the woman on top and doggy style are suppose to be more affective. But to tell you teh truth, I think my baby was conceived during doggy and my niece was conceived with mommy on top. The deeper he is in, I know, the better chance. I was instructed to lay down afterwards and not try to move right away. If at all possible go to bed after sex. Like do it before you sleep at night. There is also a fertility monitor or ovulation monitor that they sell at Walamart that lets you know when you are ovulating that can help you and guide you through the right times of the month to have sex.
Your cycle begins on the first day of your period. I heard that 14-16 days after the first day of your period is when your egg drops and its ready for fertilization. Sperm only stays alive for three days so I guess the more aften you do it in that short time span then the better. Plus this lets the hubby know you guys can have sex as much as he wants in this three day span.
If you smoke, Stop smoking. I was a smoker and I was told that was probably one of the reasons why I wasn't conceiving. If you are over-weight even by like 10 pounds (which I am) then try and loose a couple pounds. The healthier you are the better chances. I hope I have given you a couple ideas. All this stuff worked for me and now I got a baby on the way! So good luck with you and God Bless.