pseudocyesis
noun
pseu·do·cy·e·sis ˌsü-dō-sī-ˈē-səs 
: a psychosomatic state that occurs without conception and is marked by some of the physical symptoms and changes in hormonal balance of pregnancy
Example Sentences
Recent Examples on the Web Defense attorneys tried to argue that Montgomery was suffering from pseudocyesis and was in a dissociative state at the time of the murder. 
Madeleine Kearns, National Review, 11 Jan. 2021
Madeleine Kearns, National Review, 11 Jan. 2021 Word History
Etymology
New Latin, from pseud- + cyesis pregnancy, from Greek kyēsis, from kyein to be pregnant — more at cyme
First Known Use
circa 1817, in the meaning defined above
Medical Definition
pseudocyesis
noun
pseu·do·cy·e·sis -sī-ˈē-səs
plural pseudocyeses -ˌsēz
: a psychosomatic state that occurs without conception and is marked by some of the physical symptoms (as cessation of menses, enlargement of the abdomen, and apparent fetal movements) and changes in hormonal balance of pregnancy