I looked at reciprocity agreements between provinces and I don't see anything showing between ON and NS, so I don't think they can enforce it (licence suspension) nor will it (or the points) show up on your abstract here. You'll probably still want to pay the fine.
This info was based on a cursory few searches and data from
this website, so I wouldn't take it as gospel, but I think you're OK. I suppose technically, for the next 7 days, NS could consider your licence invalid if the ticket is registered in their system so I'd mind your P's and Q's and not attract any more attention.
On a different note, 20 over is a 7 day suspension...that's interesting, and people cry and moan about our "draconian" laws here in Ontario.