After 10 days of hormone injections leading up to her egg-retrieval surgery, Angella Nguyen’s belly was bruised and swollen. “THE BLOAT IS REAL,” the 38-year-old captioned an Instagram photo of her midsection after the injections. The pic lives on a profile she created specifically to document her egg-freezing process, cheekily called @sunnysideange.

“It’s the easiest online diary you can have,” Nguyen, who works in tech and lives in Los Angeles, tells The Post of her decision to share the nitty-gritty details of her fertility journey on the image-centric medium. “The things I was learning and researching about — I wanted to save it somehow.”

For a generation of women who came of age using social media to chronicle everything from brunch to breakups, egg-freezing Instas are the new norm. Scroll through enough pages of women in their 20s and 30s, and you’ll see intimate posts about hormones and ovaries sandwiched between snaps of Burning Man and yoga poses on cliffs in Capri, Italy. That’s partly because egg freezing is more common than ever: Yale researchers forecast that 76,000 women will elect to have the procedure in 2018, up from just 5,000 or so in 2013. It’s also because women are increasingly using hashtags to shine a light on serious personal issues and find common ground.

Keenly aware of the platform’s power, fertility clinics are using Instagram to target millennials through ads, influencers and irresistibly photogenic spaces that encourage patients to share.

“The Instagram of the journey is … key,” says Dr. Janelle Luk, medical director at Generation Next, a popular clinic in Midtown East that plans to open a millennial-focused division early next year. The yet-to-be-named space will feature decor and fertility-themed artwork by iconic artists such as Keith Haring, as well as “people that are already big in Miami,” according to a rep.

“We are going to make it Instagram-friendly,” says Luk.

Trellis, which bills itself as “the women’s egg-freezing fertility studio,” is set to open on West 18th Street in November. Its own Instagram feed is filled with images that suggest a trendy cafe more than a medical facility — think succulents, avocado toast and slices of citrus on a stark white background.

And at least one facility is going beyond the brick-and-mortar model: Kindbody, a new boutique Midtown fertility clinic, has an adorable van that makes stops around the city giving free blood tests for anti-Müllerian hormone (AMH), a substance secreted by egg follicles that can yield valuable clues about fertility. The Kindbody vehicle is painted cheery yellow and white, a color scheme already familiar to legions of SoulCycle adherents. The eye-catching palette extends to Kindbody’s appealing Web site and Instagram feed, where phrases such as “own your future” are emblazoned on sunny backgrounds.

In their patient messaging, modern egg-freezing facilities generally emphasize information and empowerment over hard sells. Nevertheless, some experts worry about potential conflicts of interest.

“It is less than ideal for practices to really be marketing a procedure like this, since I worry it is taking advantage of a somewhat vulnerable population,” says Dr. Heather Gibson Huddleston, a reproductive endocrinologist and associate professor at the University of California, San Francisco.

She recommends that patients speak with their regular OB-GYNs about their overall fertility before shelling out for an egg-freezing specialist. “It would be preferable if women were learning about this from sources other than [those] that stand to gain financially from women pursuing this option,” Huddleston says.

Indeed, many women’s chief sources of information about the procedure are celebrities and Instagram influencers — some of whom have partnerships with fertility brands.

Katie Sturino, the 35-year-old founder of the fashion and beauty companies the 12ish and Megababe and mom to the late Insta-famous dog Toast, reached out to the Manhattan clinic Extend Fertility this year about egg freezing. She agreed to document the process in exchange for a discounted fee — which varies from practice to practice but typically runs $5,000 to $12,000 for one round of egg retrieval, plus several thousand dollars for medications, and annual storage fees of $500 to $1,000. Her 243,000 followers were also offered a discount.

Sturino, who lives in Chelsea, says she would have posted about her journey even if she hadn’t gotten a deal, because she wants to encourage open dialogue around fertility.

“Anything having to do with it was hush-hush,” she says, adding that she received many direct messages from women who were eager to learn more.

Dr. Kriti Mohan, 32, a Houston plastic surgeon, also says she shared her story on Instagram with the aid of helping those considering the procedure. She froze eggs in June, but wishes she would have done it earlier, when she potentially would have been able to retrieve more viable eggs. But, at the time, she found information hard to come by.

“I was afraid and didn’t have anybody to ask my questions,” says Mohan, whose Instagram posts aim to be informative and often follow a Q&A format with questions such as “If you freeze your eggs naturally, can you still conceive?” and “When is the best time to preserve eggs?”

A New Jersey native, Mohan is engaged and putting off parenthood while she focuses on her career. In Texas, she says, egg freezing isn’t a common conversation topic.

“Down here, people get married earlier.”

Sturino says that even in NYC, where fertility talk is less taboo, egg freezing itself is often still a secretive experience. She says that only when she shared her story on Instagram last spring did several real-life acquaintances reach out and tell her they’d done it as well.

“I was shocked,” she says. “There’s still a stigma around it.”

Ko Im, a 32-year-old who lives in Tudor City, says that while she has plenty of friends who have gone through the procedure, sharing her experience on a unique Instagram account, @theeggidiary, provided an extra layer of support. After initial tests and consultations, egg freezing typically requires one to two weeks of hormone treatments to stimulate the ovaries before eggs are retrieved under anesthesia. Im posted dozens of confessional videos about her feelings throughout the process.

“Feeling pretty good today, yet to do my shots,” she says in one post. “I talked to my therapist about not really egg freezing but [my] relationship with my mom, what kind of mom I want to be.”

Im says social media provided a powerful source of support during a vulnerable time.

“I connected with other people going through similar journeys,” says Im, who works in media and teaches yoga. “We were virtual cheerleaders for each other.”