I originally tested as INFP (this was 16, 17 years ago- I was 14). In college, I continued to test INFP.
I lost touch with MBTI for several years, and rediscovered it after having my two children, during a time when I wanted to reconnect with my husband. We bought and read Please Understand Me II and used it as a launching pad for discussions about ourselves, each other, and our relationship. At that time, I tested ISFJ.
After some time self-identifying as an ISFJ, I began to wonder whether it really fit me. I then began to self-identify as an INFJ.
Now, I'm pretty sure I'm not a J. Could I have been right all along, and I'm actually an INFP? Did I need the motivation of motherhood to find my true ISFJ self? Am I just a scatterbrained INFJ? Or, is it all wrong and I'm actually an ISFP or an INTP?
A note: this is all very light-hearted and slightly tongue-in-cheek, as I am no longer convinced that MBTI is useful as anything but a vocabulary and a system for describing (not prescribing) human behavior. There is too much ambivalence, subjectivity, and reliance on navel-gazing involved for me to think it's scientific, but that doesn't mean we can't use it to describe ourselves and each other.