Period disappeared!

Jessica • Edd 11/9 #3 after losing 6 mo old daughter last July & having a tubal reversal in September. Hoping for a rainbow baby!
So yesterday I put in a bfp but got worried that maybe it was evap so I deleted it but it also erased my march period and any future predictions.  I tried adding it on the period log and it hit save and it says prediction updated then as soon as I exit the period log it disappears from the calendar