Are periods after having a baby often irregular to start with? Had my first period after having Amelia in March, and if I go off the length of my cycle before getting pregnant I'm 6 days late. Have to admit I'm fretting a little as we had a little slip up a few weeks back & I took the morning after pill pretty sharpish (felt like such an idiot). I haven't had any pregnancy related symptoms, although I have had some mild cramping- but still no period. A test 2days ago came up negative.