How old is she?
Yorkies usually bleed very little, so you may see stains on blankets, but sometimes you won't see anything coming out down there. The smell of their breath can change too.
Nah, don't feel stupid. It's a new thing for you. Your girl really should be spayed before her second heat.
If for whatever reason this isn't what's going on, then she would need to see the vet.
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