Hi,
Definitely, cryptic
pregnancy, though not common, still may be a possibility, incident being 1 in 500 of total child birth. The reason may be low
hormonal levels of HCG and hence, cannot be usually detected in urine or blood, therefore giving the negative results for pregnancy. Common condition like PCOS, perimenopause, extreme stress are the conditions, where hormonal fluctuation can give negative pregnancy results and hence a cryptic pregnancy.
In these days, rate of cryptic pregnancy is becoming low due to presence of modern imaging techniques like
ultrasound etc. However, in some cases, even ultrasound may give a false negative result due to abnormal position of
implantation, abnormal shape of uterus as well as an overlook by the ultra-sound technician due to a pre-determined thinking in mind of negative blood and urine results for pregnancy. As heredity may also be one factor for cryptic pregnancy, therefore, in your case, a careful re-evaluation by
ultrasonography may be advised.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Satnarain Bansal, General & Family Physician