My seven-month-old Cavalier King Charles came into season on Thursday – that was the first day I noticed visible bleeding, though I had noticed she was urinating more often than usual a few days before.
I'm going to get her spayed three months after the season (on the advice of the breeder and my vet, who recommended letting her have one season first).
But I'm now really worrying because she went to doggy daycare on Wednesday, the day
before she started bleeding. I spoke to the daycare woman and she said she had an entire male dog in that day as well.

I spoke to a nurse at the vets and she said that as there was no bleeding on the Wednesday, it's unlikely she could have been mated / receptive. Still can't help worrying and thinking 'what if...' though!
Do you think there's cause for concern that she was near an uncastrated male the day before visible bleeding started?