Anti-abortion groups called the referendum result a "tragedy of historic proportions" with one saying it was already making plans to protest outside abortion clinics when they eventually open in Ireland.
Members of Rosa (Reproductive Rights, Against Oppression, Sexism & Austerity) will offer the pills from an "abortion bus" touring Belfast, Derry, Lisburn and Cookstown.
On Saturday, the global development secretary, Penny Mordaunt, said Ireland's vote was a "hopeful" day for the north. "That hope must be met", she said on Twitter.
According to the Sunday Times, four former holders of the role - Amber Rudd, Justine Greening, Nicky Morgan and Maria Miller - all support Ms Mordaunt in her backing for change in Northern Ireland. And unlike other parts of the United Kingdom, abortions are banned apart from when the life or mental health of the mother is in danger.
Both Lives Matter, an anti-abortion organisation in Northern Ireland, has called on the police to arrest pro-choice activists and seize abortion pills when the bus arrives.
"These pills are illegal so it is clearly up to the [police] to do something about it".
"Friday's referendum has no impact upon the law in Northern Ireland, but we obviously take note of issues impacting upon our nearest neighbour", DUP leader Arlene Foster said in a statement.
It comes as the official results of the referendum were announced on Saturday evening. "It should be named for her".
However, the Northern Ireland government fell apart past year after months of political intrigue and the assembly hasn't met since January 2017.
Another demonstrator from Belfast said the Republic of Ireland was "giving a voice to women".
"The people have spoken, and they've spoken very loudly", she said.
"We best get some more supplies to Ireland". "No more lonely journeys across the Irish Sea".
While the seriousness of the issue was certainly not lost on any citizen who took part in the vote, the enormous relief brought out a few scenes of odd joy as the crowd was told by Taoiseach Leo Varadkar that "Ireland will still be the same country today as it was before, just a little more tolerant, open and respectful".
"While the government can say that abortion is a devolved issue, human rights are not, and the collapse of the [Northern Ireland] assembly means that the power to right this wrong lies exclusively in Westminster", added Clare Murphy, director of external affairs at the British Pregnancy Advisory Service, a national charity that provides abortion services.
Sarah Wollaston, the Tory chairwoman of the Commons Health Select Committee, said: "I would vote to support an extension of abortion rights to all women across the whole UK".
The abortion pills, mifepristone and misoprostol, can be taken up to nine weeks into a pregnancy and have been approved for use by the World Heath Organization since 2005.
In cases of a fatal foetal abnormality, abortions can be carried out after this date.