Giving my Parents Married Kid Lessons

Lately there has been one subject on my mind and that is babies.  It starts first thing in the morning when I log onto facebook and view other peoples babies and continues throughout the day as I eye google other people's babies on errands or at church.  Yes I am very much aware that I have two, lovely guinea pigs and they are adorable, but they are simply not a human child.  This is brought up on a regular bases every time I go visit family.  An example of this is me and my husband were visiting with family and my brother introduced me as the married sister who has not yet produced him a niece or nephew.  A few days later it was painfully brought up again when I was browsing the internet and my father came in and changed the webpage to things you need to save up for and buy for a newborn.  With the statement if you start looking at it now then maybe I will have a grandchild in at least five years.  I know my family means well, but it does sting.  What they do not know, and what I need to give my parents a lesson on is how to interact with your married child on the sensitive subject of offspring.  When me and my husband entered married bliss there was the mutual agreement with my family that I would finish school and my track scholarship, after all you cannot get pregnant and run for the track team.  As soon as I graduated two months ago, there has been a relentless stream of when are you going to have a kid?  Unknown to my family since day one of marriage me and my husband have given first to the lord, then to savings, including a cushioned child fund (we are very aware they are expensive), and then to spending.  This spending lately has been used to fund various guinea pig living conditions.  Mainly because I have been off the birth control for awhile and stay up many nights wondering why God has not blessed me with a little one.  I simply focus on the guinea pigs because they are a sweet minute of distraction of my worrying constantly of why I am not with child.  In no way are the pigs a replacement for something that I have saved for, prayed for, and dreamed about for, for my whole life. That's it I feel better.  I still love you mom and dad, and family.