The Love Both campaign, which is in favour of retaining the Eighth Amendment, has launched its campaign in Dublin.
Spokesperson Cora Sherlock said if the Eighth Amendment is removed, the Government will initiate a nationwide GP-led abortion service on request in the first three months of pregnancy.
She said Minister for Health Simon Harris brought forward the proposal, without consulting general practitioners.
Love Both's legal consultant said a vote for repeal is a vote for abortion on demand.
Caroline Simons criticised the proposed legislation, which she said allows for abortion on vague and undefined "health" grounds, up to viability and birth where the baby has a potentially life-limiting condition and in other circumstances.
She said voters who support abortion in so-called limited circumstances need to know what they hope for with repeal and what they would get are two entirely different things.
Ms Sherlock said the campaign is funded by ordinary people around the country.
She said people are telling her as she travels around the country that they want to support the campaign to vote no.
Ms Sherlock said Love Both does not have funding coming from abroad.
Ms Simons said there are accountants working carefully to ensure everything (regarding funding) is done properly.
She said the Pro-life campaign has always been in contact with the Standards in Public Office if there are any questions, to make sure things are done correctly.
Ms Simons added that many of those at this morning's campaign launch, including herself have given their services for many years voluntarily.