A mother who conceived by accident said having children later in life was "definitely more common" than most people thought.
Cheryl Millar, 43, told Good Morning Britain of her shock when she fell pregnant with her daughter Grace eight months into the relationship with her partner.
"Because of my age I automatically thought, 'Oh everything will be OK. I probably won't get pregnant.'"
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The Metropolitan Police Federation, which set up the official JustGiving site, said it felt a "suitable amount" had been collected.
There is no evidence the Westminster attacker Khalid Masood was associated with so-called Islamic State or al Qaeda, the Met Police said.
Janet Ajao said in a statement: "I do not condone his actions nor support the beliefs he held that led to him committing this atrocity."