I'd leave her alone. Trying to feel her stomach can be dangerous to any would be babies, plus it's terrifying to mommy mouse. I haven't met a mouse yet who's tame enough to put up with having it's tummy pinched and prodded.
Definitely just wait two weeks. If you think she's prego now then in two weeks it will look like she swallowed a golf ball. It's not fool proof sometimes they have a very small litter and don't get that big but usually you'll see it.
If you want to be sure of having mouse babies leave the male in with her till the two week mark, if you plan on removing him. If you're keeping a permanent colonie just be patient, you don't need to do anything but sit back and watch them produce.
3 week gestation doesn't sound like very long, but it can seem like forever, huh?
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