If the dog is still bleeding she probably did not let him mount her.
Heats last about 3 weeks and they should be apart the entire time.
The first week they have bloody discharge the second its straw colored and days 9-14 are the most likely days for breeding and the final week the dogs may still be breedable.
If they breed I'd expect its darn close to 100% chance she would get pregnant.
You can do a relaxin test at 22 days but I'd suggest just spaying her anyhow as finding permanent homes for the pups would be a chore.
www.bullwrinkle.com/ShoppingPages/ dog-pregnancy-test-canine.htm
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