Am I suffering from pseudocyecis which is triggered by extreme fear of being pregnant? How common or rare is it? And is it really possible for our mind to trick the body into behaving as if it was really pregnant? I am experiencing  stomach size increase, developement of linea nigra on stomach, etc. When all other pregnancy tests like multiple urine pregnancy teat and multiple B hcg blood tests are negative and even pelvic USG shows no pregnancy? Morever I didnt even miss my periods and have got 3 periods after the contact.