anyone else?

well firstly thought i would say hi here as don't think no one has seen my newbie post lol, anyway does anyone else ever get the feeling they can never have kids? I sometimes get this horrible fear in me and i don't know why. I know there shouldn't be any problems as there is no problems in my family so i think it could just be me and where i want kids so much in my life i dread not being able to have it maybe?! Also could someone explain the lingo to me lol, i don't understand the 'cm' and other things lol, thanks in advance