Chantal Labib, a 24-year-old school teacher, told ABC News that she saw news of the blasts on TV before she went to Palm Sunday services at another church in Heliopolis, Cairo.
The bombings in Tanta and Alexandria were claimed by ISIS and followed warnings by the extremist group that it would be stepping up attacks against Egypt's Christians.
The first blast occurred in the Mar Girgis Coptic Church in Tanta, and the second several hours later in Saint Mark's Cathedral in the coastal city of Alexandria.
The bombings followed a similar recent blast in Cairo's largest Coptic cathedral in December that killed at least 25 and wounded dozens more, many of them women and children.
All three of the explosions produced gory imagery that was circulated heavily on social media, with some showing mutilated bodies scattered among shards of shattered church pews.
Egypt's Christian minority makes up roughly 10 percent of the country's population, according to a recent estimate by the CIA.
Labib told ABC News that she is wrestling with whether to leave Egypt.
"I love my country and was always critical of those who wanted to leave," she said. "My father has been wanting for us to leave for so long and we had the opportunity to move to the U.S., and I was the reason we didn't go."
"But now i think that we only live once. Why should I waste my life in a place where I can't even pray?"
Nancy Emad 26, a case worker with an international nongovernmental organization who heard the news of the church bombings on her way to mass today in Cairo, told ABC News that she wrestles with whether to leave, but for different reasons.
"With every attack I feel like I'm less of an Egyptian, but this is not what will make me leave the country," Emad said. "I can leave for better economic opportunities, but not because my safety or my spirituality is not guaranteed because I will pray whenever I want and wherever I want. No one gets to decide [that] for me."
"I dont know if the state could have stopped this," Peter Salib, 23, a student, told ABC News. "Terrorism is unpredictable. For example, the suicide bombing in Alexandria happened on the street before he entered, how could they stop such things?"
The U.S. Embassy in Cairo also condemned both attacks in separate statements.
"The United States stands firmly with the Egyptian government and people to defeat terrorism," both statements said.
ABC News' Ben Gittleson contributed to this report.