Pregnant on BC

How many of you got pregnant while using the mini pill? If you did, were you a perfect user? I have only been late taking it once, but my husband and I waited a few days before having sex again. I take my pill within three minutes of noon everyday. I'm late, though. The only time I've ever been late was when I was pregnant, even when I've been on birth control previously. My daughter is only 3 months old... I'm kind of freaking out. I've tested, but my last pregnancy didn't show positive until I was a week late. I'm trying not to stress, as I know it can further the lateness of your period, but I am so not ready for another baby. I'm just looking for experience. Thanks!