Answer by  
                                                                                          Roland27 (16334)
                                                            
                          
                          
                                                          Not it is not. The average Luteal Phase lasts from between 12-16 days long. So one day short isn't something to get overly concerned about. If your luteal phase is drastically shorter or drastically longer than the average then it's a good idea to at least ask your doctor about why that is happening.