Glow calendar question

Amanda • Im 27 - i have a 4 year old daughter and my husband and I are working on baby #2!! Im beyond excited and hoping and praying for results by the end of the month!!
So, I looked on my calendar and I clicked the "my period is late" button. It has seemed to give me another period coming up...is this simply saying that this is when my period could happen since it is late??? I'm confused