Heat/Season question

I had a Wire Fox Terrier growing up that we never had spayed. She developed a Pyometra after her 8th or 9th heat and I remember there was a truly awful smell, and very little of, her discharge.
I certainly hope that's not the issue with Piper, but a vet check might be wise?
:crossfing it's nothing.

Had a cat that had that.....pus just poured out in puddles / no warning at all.
It was a trip to the emer vet that night.