She’s the mother of all surprises.

A British woman who believed she was suffering from appendicitis was stunned when she gave birth to a baby boy in the back of the ambulance.

“I was speechless -— I couldn’t believe what had just happened,” new mom Megan Isherwood, 26, told Southwest News Service. “I had no bump, no symptoms at all, he just came out of nowhere.”

Isherwood awoke in the morning of Sep. 9 suffering severe pains in her right side and she soon began vomiting up blood. Realizing that her situation was serious, the bar manager called for an ambulance.

Paramedics arrived and checked Isherwood over, assuming she was suffering from appendicitis due to the pain on the right side of her body as well as her high heart rate and nausea.

She was taken to her local hospital for further examination — but the situation quickly escalated.

Isherwood was preparing to be seen by a doctor when blood began “gushing” out of her, soaking the bed.

“15 doctors were crowded around her trying to find out what was wrong,” the Blackburn resident recalled. “They decided to do a CT scan as well as an ultrasound to rule out pregnancy, but that was when they found a head and a foot. They then blue-lighted me to [nearby] Burnley hospital as they have a midwifery.”

Isherwood was unable to make it to the next medical facility in time, giving birth in the back of an ambulance with several paramedics on hand to help with the delivery.

“I just needed to push,” she stated. “The next thing you know they told me ‘congratulations it is a boy.’ I was so shocked and flustered, I couldn’t believe what had just happened.”

However, Isherwood’s amazement turned to panic, when medics realized the tiny baby was blue and had stopped breathing.

Thankfully, they managed to resucitate the premature infant — who Isherwood has named Jaxson — before they arrived at the hospital.

The mom and son were taken to the Neonatal Intensive Care Unit where they were both diagnosed with sepsis. Thankfully, they made a full recovery.

Finally, on Sep. 25, Isherwood was able to return home with her suprise baby boy.

The new believes the father is a man she is not in a relationship with.

“I struggled to get my head around what had happened,” Isherwood said about the initial adjustment.. “I was thinking to myself where have you come from.”

Despite being taken by surprise, Isherwood instantly took to becoming a mother, and says she’s overwhelmed with feelings of love for baby Jaxson.

“He is is doing absolutely amazing,” she declared. “He is a miracle.”