Sorry, this is unclear to me. If there was no bleeding, what makes you think she was in heat? Dud you actually try to breed her or know she tied with a male? If that is the case, how along ago was that?
IF she is pregnant, bleeding would be a cause for concern and she should be examined by a Vet, as Misfits stated. Depending on the amount and duration of bleeding, a small dog like that could become anemic.
Yes, please clarify and come back to update.
Welcome...There is no way for us to tell if this is normal bleeding or not....If she is indeed pregnant & the bleeding has started since, then NO, she's not OK.....You need to get her to her Vet ASAP....This could be any number of problems & we cannot diagnose over the internet....I hope she's alright...
Let us know what you find out....