What breed do you have? And how long was the teaser out for?
If the ewes are already cycling then the teaser has no effect. If they are near to the natural breeding season then thats when they are stimulated to come in to season sharper & more syncronised. However You should replace the teaser with "real" tups at 14days maximum, and most of the ewes will be served in the next 10days. If the teaser is left in longer you will miss the first proper oestrus & have to wait another 17d or so until the girls are back in again.
If you saw the teaser jumping ewes he was in too long!