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Couple Jocelyn Galvez and Nick Jahn were shocked to learn that they were expecting identical triplets girls

According to UCLA Health's Dr. Ilina Pluym, who was Jocelyn's physician during the pregnancy, the odds of that happening are between 1 in 100,000 to 1 in 1,000,0000

Sienna, Lily and Rose Jahn were born on June 25, each weighing about 3 lbs.

After being together for 10 years, Jocelyn Galvez and Nick Jahn decided they were ready to start a family.

This January, the engaged California couple were both on hand for Jocelyn's initial appointment with her OB-GYN. During an examination to confirm that they were indeed expecting, they got some surprising news.

“We found out that there was not just one heartbeat — there were three heartbeats,” Jocelyn, 27, tells PEOPLE. "To

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