haha i know that is annoying... it probably means something is in your sim's way so they can't get to where they are trying to go. try moving around objects that might be blocking it.
Well if you really want them to all you have to do is hold down shift ctrl and c all at once. This activates the cheat bar. then click on the cheat bar and type in 'boolprop testingcheatsenabled...
When your Sim's gets pregnant it usually takes 3 days. On the third day you Sim's will have birth. It'll go through a process and then it'll say "You have added a member to you family" After that...
Sorry don't think you can. But you can download objects off of the internet of off different websites :) But you are able to make hair make-up, gentetics and different things on Sims 2 body shop :)