Trying to get pregnant

Im 27 yrs old, and I have one child and it didnt take that long to get pregnant with him. He is now 6. But now im ready for another baby but iv been trying for a year and nothing yet, and I really want one more befor im 30, n hoping to have a girl this time. Does anyone have any ideas on why its taking longer trying to conceive for my 2nd baby then it did my first . N or any ideas on how to get pregnant fast.? Thanks!