Do you have any links to data to back that up?
I was unable to find any particularly solid figures, about the best I could find was
this, cross-referencing with
this census, gives an approximate abortion rate for northern ireland of 3.2, compared with 17.8 for england/wales.
The figure for Northern Ireland is, doubtless, an underestimate for the reasons given in the link, but it seems unlikely it's an underestimate by a factor of 5 or more needed to bring the figures up to the level observed in england/wales. Interestingly, the figures for scotland are much lower than england/wales but still a factor 4 larger than those in Northern Ireland.