I'm sorry, I have not had one- do you think you are experiencing one?
There's a increasing misuse of the phrase cryptic pregnancy at the moment thanks largely to a couple of websites and facebook groups. These sites are promoting either false or delusional pregnancy as being a cryptic pregnancy which is why these women have in some cases been "pregnant" in excess of 2 years.
Cryptic pregnancy does exist and is medically diagnosed when the woman does not know she is pregnant until after the 20 week point, however the magical cryptic pregnancies that last in excess of +-40 weeks gestation period do not exist.