Positive then negative test

Zoe 🇬🇧 • Mummy to two girls 🥰🥰. 👼🏼 March 18 👼🏼 June 18 👼🏼 sept 18 👼🏼Oct 18 👶🏼 👶🏼lost twins due to pprom at 16+4 6th feb 19 💛❣️

Has anyone every had a positive test (faint but definitely positive) followed by a negative ?