Hi we took our girl to the proven stud but only managed one mating on day 13 are the chance of pregnancy alot lower cause only had one mating with 20 min tie

I've had 15 puppies from one mating. If the timing is right, it should be fine :)

We tried every day since day 10 but was only day 13 she would stand tried again day 15 but only manage a slip

If you got the right day then a single mating is fine.

We had 13 puppies with one mating and at 20 min tie.

The dog I have just used on my bitch would only mate her the once, and the bitch who he mated previously to her, yesterday produced a litter of 8 to just one mating (6 being average litter size).

Thanks fingers crossed now the long dreaded wait to find out

(56 being average litter size).

oops! edited, clumsy fingers.

One mating & no tie, can still result in a litter if the timing is right...

I only ever do one mating and never had a bitch miss yet.

One of my stud dogs only ever managed a slip tie, but his strike rate was 99.9%      He only missed to one bitch who came back to my other proven dog next season, and missed again.   She took her elsewhere the next time, and again she missed.   Clearly the bitch wasn't meant to be a mum.

One good mating (and the slip) should be enough.    It's not hit and miss with dogs as it is with humans.    If the bitch will allow a mating, and the male is fertile (it helps to be proven), she should be in whelp.   However, there are no guarantees, and she may not carry to term - bitches can reabsorb.

Plan on a litter, and wait. 

ps   By around 5 weeks you'll probably see some thickening of her flanks.   By week 7, you should see the puppies moving around.   Also, with some experienced stud dogs, once they 'know' they have successfully mated with a bitch, they may not be very interested to do a second mating.   Quite possibly it has to do with the scent of the bitch - a recent prog. I watched suggested scenting in the dog plays a HUGE part in how they behave - response.   Far greater than we fully realise.

One of our girls had the briefest of matings...it was literally seconds...before he fell out...We tried again the next day, but he wasn't interested and we were totally convinced that we'd missed her that time round. To our utter amazement it resulted in 12 puppies!