positive then negative

Kristyn • Four angel babies. 👼🏻 👼🏻👼🏻👼🏻 2nd IVF cycle We are praying for our miracle.
Feeling really devestaded. Is it possible to test positive and the next day test negative?? 
This was yesterday's. I took a test again but it was not in the morning it was right now. 
Can this be? 😭 
Glow said I was supposed to get my period yesterdat, still nothing yet.