Hello~.  Truffle came to our home at 8 weeks old and have been only pad girl,  traveling to few hours away, she holds it till get to pad in private area... ( I even put pad in my car trunk and only once she peed on pad in trunk lol)
  I was worried if I let her start go out side to potty will change her pee pad in house or accidents start....   we've  been taking her for walk everyday morning and evening( she usually potty before leave the house for walk)  and finally  she start go potty outside sometimes when we are out! 
  now she is 6months old.   also we just moved to 3 story townhouse and she has pads on each floors and so far she is wonderful .  
  I almost give up on her go out side for potty but she did so you never know