I agree w/ you alaskayorkie. Good advice.
Ok, both your babies are way too young to 'get the big picture' yet. And you definately don't want to 'scare' them either. If you catch them peeing you just give them a stern 'no' and immediately carrry them to either a pee pad or outside. If you 'scare' them while they're pottying it's probably going to think your punishing them for something they can't help but do. There's a difference between trying to teach your puppy where to potty and clapping your hands to correct a full grown potty trained dog for misbehaving and knowing it! Meaning, don't startle young ones who are trying to learn and don't know that what they're doing is wrong. But like w/ my guys who are already potty trained and have been so for years if I catch them pottying I will clap my hands to make them stop, then take them outside and then give them a belly rub for pottying where they're supposed too.
It also sounds like they have too much freedom on their own in too big of a space. Harley learned to use his pee pad in his x-pen. It is small, lined w/ linoleum and full of toys to play with. When I would go to the kitchen or to watch tv a pee pad went with me and so did he. For the first 4-5 months he never left my sight. Because I knew if he did there would be accidents and that would be my fault. A puppy can only be expected to hold it's business for one hour for every month old it is. She may not being showing signs of having to go potty yet but that may be because you just haven't learned her signs yet. Often times we think our yorkies don't get what we're saying and we get frustrated. But imagine how frustrated they must be when inside they're screaming, "I gotta go! I gotta go!" or "Mom I'm starvin!" but we can't understand what they want yet bc they can't even talk!
That's why it takes time, patience and a lot of 'hawk eye' action lol Keep your chin up, I know it's not easy but it will happen.
The number one thing with any sort of training is always consistency, consistency, consistency. A dog learns best through rigorous, repetetive behavior. It can be done, I have six and all are fully armed w/ potty training.
And remember it really is just as frustrating for your little ones to have accidents. They don't mean to but it happens because they're babies and they're learning. They want to please you. (no matter how irritating they can sometimes act
)