Hi Teretta,
I'm sorry I didn't see your post sooner. I've had a fair amount of
experience with this. I believe at two weeks it's a bit too late to try this. When the chicks are born, the key on their mother and imprint on her. They also know the sound of her voice when they hatch. If the chicks are a day or two old and you slip them under the hen when her first chick hatches, it sometimes works. But at this late date, the hen would probably notice the difference and the chicks will probably not recognize her as their mother. Sorry, but your best bet is to raise them on their own till they get big enough to make it with the flock.