Emilie Spiegel is 34 years old, single and has no interest in freezing her eggs.

“I am very open to having children one day if it works out,” Ms. Spiegel said. But right now? “I am not seeking fertility treatment in any way, shape or form.”

The ads in her Instagram feed suggest otherwise.

During one recent scroll she encountered an ad from Extend Fertility showing a pink smoothie strewn with beautiful berries. “If you can afford this,” it said, followed by: “Egg freezing is more affordable than you think.”

“I found this to be particularly offensive,” said Ms. Spiegel, who estimated that she sees ads for egg freezing at least once a week. “It’s possible to be a woman and not want to have a baby.”

Ms. Spiegel, who lives in Brooklyn, didn’t have to go far to find another friend who had experienced the same thing.