Washington (CNN) Donations to abortion-rights groups surged this week as presidential candidates, activists and even a group of Portland, Oregon, basketball fans reacted to Alabama enacting the nation's strictest abortion law.

In four days, the National Network of Abortion Funds raised $504,000 from more than 18,000 people to help fund abortions, according to executive director Yamani Hernandez. That's nearly double the 9,500 donations the group receives annually, she said.

"I feel like people have our backs," said Hernandez, whose organization supports 76 other funds in 41 states that help low-income women pay for abortions.

Contributions to one of those funds in Alabama, The Yellowhammer Fund, easily surpassed $350,000 as of Friday morning -- far exceeding the group's roughly $80,000 annual budget, its executive director Amanda Reyes told CNN. The group helps underwrite abortions at the state's three independent clinics and provides financial help to women who travel out of state for abortions.

The total raised could be higher, Reyes said, because "it's been impossible" for her to track the donations "pouring in from so many sources."

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