The Irish Family Planning Association (IFPA) says some women continue with a pregnancy against their wishes because of the challenges in trying to travel out of the state for an abortion.
In its annual report released this morning, the IFPA says while some women to access services abroad others are forced to become a parent.
The report says 26 migrant women with travel restrictions attended the IFPA in the 12 months to the end of September, indicating they wanted an abortion.
Of these, five were forced to continue with the pregnancy, while four were considering or took an abortion pill.
A further 17 did not return to the association and their outcomes are not known.
The annual report also notes an increase in women over 50 attending for sexual health services - including infection screening - while the number of those aged over 44 more than doubled compared to 2012.
IFPA Chief Executive Niall Behan said: "For decades the government has relied on women being able to leave the State to access abortion services. However, the reality is that many women cannot do so due to legal, financial and other barriers. These women face enormous challenges in obtaining the documentation and funds required to travel."
The report also highlights that the legal framework on abortion restricts IFPA counsellors in what support they can give to women who have difficulties in travelling.
The IFPA says it has seen high demand for post-abortion care - in 2013, women and couples seeking counselling for this accounted for almost half of all counselling clients.
"Women attend post-abortion counselling for many reasons, increasingly to express their frustration at being forced to travel to another state to access abortion services," it says.
