A source previously told OK! that the pair would love to give baby Archie a sister.
"Meghan's always dreamt of having a mini-me," spilled the source. "But of course, they're just happy to have a healthy baby on the way."
The duo didn't share if they had chosen a name, but it was reported in the royal biography Finding Freedom that they chose their first child's name before the birth, with the text reading, "According to a source, they settled on their son's name some time during the final week of her pregnancy."
Some thought that Meghan hinted last month that they were expecting a girl, as she wore a pink sapphire ring during her Spotify’s Stream On Event appearance.
Royal biographer Ingrid Seward previously shared her name predictions, stating, "I'm certain that neither of them will feel obliged to use any of the standard royal names. I imagine they might go for the Victorian style names which are all symbolic of colours.
"For a boy, they may choose Red, which is Redmond, Blue or Grey," she continued. "Whereas for the girl choices, I can see them turning to the flowers; Daisy, Primrose, Violet or Ivy. I certainly don't think they'll be following Gwyneth Paltrow's steps by looking to fruit."
According to an OK! source, the couple decided to wait until Meghan, 39, was "safely into her second trimester" to share the news of her pregnancy. "They only told a handful of family members before the public," said the source. "They wanted to cherish this secret for as long as they could."
The pregnancy news comes only months after it was revealed the Duchess of Sussex suffered a miscarriage last summer. The Suits alum revealed the personal matter in a heartbreaking op-ed for The New York Times and admitted she had a feeling that something was wrong during the pregnancy.
"I felt a sharp cramp. I dropped to the floor with [Archie] in my arms, humming a lullaby to keep us both calm," she wrote, adding that she knew she had lost the baby.
After overcoming what Meghan called "unbearable grief," she and Harry, 36 — who have been nesting at their Montecito, Calif., mansion — "have been busy prepping the nursery," dished the source, noting that they're making sure it's eco-friendly. "They've bought energy-efficient lighting and are keeping it as plastic-free as possible."