i mated her for the first time 10 days ago, she had stopped bleeding 2 days prior to this, she was mated on days 2 and 3 after the bleeding stopped, the first tie was 20minuets and second 12minuets. she hasnt bled since then, but today i noticed a small amount of pale brown discharge, it does not smell. could this mean pregnancy?

There is no way you can detect pregnancy so soon after a mating. Sounds more like the end of the season to me.

Me too.   Note, bitches will continue to be 'in season' for the usual length of time - so take care of her or she could be mated by another dog!!   Most of mine seemed to 'come out' of season pretty soon, early, after being mated but I had one who went into a more blood-coloured discharge through the third week.   I was worried although in herself she seemed fine and it stopped by around day 21.  She had an uneventful pregnancy and 9 super puppies so good that we kept 3 who came back to the UK with us, one taking a UK title, and her sister her perm.Crufts qual.  Their brother is back of a number of lines in the UK, from the two only matings outside our kennel I allowed.  I also tend to see the vulva staying more pronounced but again it really is a question of wait and see, and plan for a litter.

Some bitches will be quieter, more careful from the start, others will be hooligans up to the time their girth means they can belt around.   By 5 weeks you will probably see a thickening of the flanks and by 7 weeks usually, you'll see te puppies moving around.

yes her vulva is still a little swollen and seams to have a shade of darker skin just underneath it which has never happened after a heat before. but still i think im looking for signs and like you say its a wait and see game