this happened with the yorkies that my mom breeds.
The... erm... "sticky solution" causes a problem after the good deed. The yelping was just the girl crying because fur and skin got stuck during the process.
We had li'l pups afterwards, so... you should be fine (if by "fine" you mean "have babies".). They'll probably do the deed a few times, and you'll hear more yelping.
i'm a sicko and thought it was pretty funny!