Most women who have an unwanted pregnancy were using contraceptives at the time, a Legislative Council committee has heard.
Hobart Women's Health Centre executive officer Glynis Flower told a committee into the Reproductive Health Bill that most of the women who present at the centre seeking termination advice were "almost always on a pretty rigorous contraceptive path, and it's failed in for some reason."
Ms Flower said more than half of all unplanned pregnancies occurred when contraceptives were used, and 42 per cent were using the contraceptive pill.
She told the committee that Tasmania had the country's lowest rate of health literacy, so a lot of women did not know how to correctly use contraceptives and did not know how to go about accessing a termination.
"The current legislation causes confusion, increases stigma, restricts debate and decreases access," Ms Flower said.
It's the fifth day of hearings on the committee into the Reproductive Health Bill.
The proposed legislation, which passed the lower house in April, would decriminalise abortion but require two doctors to say it is necessary on physical, psychological or socio-economic grounds for terminations after 16-weeks gestation.
Anglican Dean Richard Humphrey told the committee he opposed the legislation because it was "extreme" and made no mention of the life of the child.
"The bill as it stands seems to indicate that the child has no value, which is surely extreme and is undermined by the very fact that we have a bill," Dean Humphrey said.
Dean Humphrey said the conscientious objection clauses would force some doctors, like his father, an obstetrician who left England because of abortion laws, to leave the state.
And he said abortion also impacted on women, adding that women often approached him to talk about the trauma of their abortion.
Dean Humphrey said the conscientious objection clause as it applied to counselling would affect priests, and said there would be some situations where he could not in good conscience give a woman information that could lead to an abortion.
"If I think she is about to make a very selfish and damaging decision, why would I facilitate that decision?" he said.
Rummey independent MLC Tony Mulder said the conscientious objection clause in the bill only meant providing a woman with information of a phone number of another service, it did not mean they couldn't give reasons for their objection.
"People keep reading I to it that the doctor is not even allowed to talk about it, and I don't see that at all," Mr Mulder said.