My bitch will be 3 next month.
Her seasons arrive every 6 months but tend to be on the long side.
She was mated last April on  days 18,20 and 22, had 3 successful ties but didn't produce any pups.
Her season lasted 6/7 weeks in total.
This time she has been on antibiotics, vitamin E and I had a swab taken at day 10 to ascertain ovulation. Was told she would be ready for mating the next day!
She was mated on days 12,14 and 16, again with successful ties.
When she was collected from the kennels about 2 weeks ago (day 20) her season had finished.
Is this a promising sign?

Mated on days 12, 14 and 16.  Her season over with 20 days.  Sounds perfectly normal to me!  I wouldn't think, however, that her season finishing in a normal way (after 3 weeks) could be interpreted as a definite sign that she is pregnant.  You'll have to wait a bit still.  But what I am wondering is:  why was she on antibiotics?

Hi, regarding the antibiotics.
I was advised by a couple of reliable sources in the breed (including the owner of the stud, a top breeder) to put her on antibiotics.
This was to clear up any possible infection which might be preventing her getting pregnant.
Fingers crossed!

> why was she on antibiotics?

Some years ago, owners of stud dogs started asking that visiting bitches be put on a broad spectrum antibiotic - however, when I asked my vet at the time, she said what for - your bitch(es) is perfectly healthy!!   She didn't prescribe me anything.  And that was actually quite right!   I was allowed to use that stud dog

As for going out of season quickly (except they are not really!) when mine had been successfully mated, this was one thing they usually tended to do.   However I had one who shortly after having two good matings (on days 11 and 13 as I remember) came back into a blood coloured discharge through the final week.   So much so that although I wasn't worried about her medically, I thought she's never taken!    Her pregnancy was uneventful and she produced 9 of what was the best litter I'd ever produced, so good that we kept 3 of them, brought them, with 4 others, back to the UK when we came 'home' and the two bitches both qualified for their Stud Book numbers, one gaining her UK title.  The male's bite went edge to edge by the time he came out of quarantine, so I couldn't show him seriously (scissor bites only in my breed).   I did let another breeder use him, knowing about his fault and she had 2 litters from him, all good and he's now back of a number of hounds in the UK, including my current buy-in.

Thank you for your reply MamaBas.