( CNN ) Fifty-one minutes is all the time Katie Kropas had to prepare for what most expectant mothers spend nine months planning for : motherhood . `` I found out at 10:15 and I had her at 11:06 , '' Kropas told CNN affiliate WBZ . The Massachusetts woman said she woke up Tuesday morning with lower back pain so severe , she was rushed to a hospital in Weymouth , south of Boston . `` They told me that I had a full-term baby , ready to come now , '' she said . Less than a hour later , Kropas gave birth to her 10 pound , 2 ounce daughter Ellie . Kropas said the obvious pregnancy symptoms just were n't there . Her mom Karen Kropas agreed , telling WBZ , `` I could n't believe it . I could n't get my head around it , and I live with her . As a female , there were no signs . '' Cryptic pregnancies , as they are called , are n't completely unheard of . Cable network TLC even created a show about them , `` I Did n't Know I was Pregnant . '' But exactly how common they are depends on who you ask . According to one Serbian study , an estimated one out of every 7,225 pregnancies is unknown to the mother until the moment of delivery . Dr. Kim Dever is the chair of obstetrics and gynecology at South Shore Hospital , where Kropas gave birth . She said of the approximate 3,500 annual births at her hospital , `` we probably see this a few times a year . '' Dever said it often happens if the woman is overweight or has irregular periods . If the mother-to-be was n't planning to get pregnant , she might confuse baby movement as gas , Dever said . `` I thought I had put on some Christmas-season weight , but I never thought I was pregnant . Never , '' Kropas told WBZ . Without any time to prepare , Kropas said she expects the first few weeks with her daughter will be challenging , but worth it . `` I love her , '' she said .
New mother found out she was pregnant just days before giving birth . The police said she thought she put on Christmas weight . Note : 1 out of 5 pregnancies are ` ` cryptic pregnancies ''