10 days change and new line on my chart

Alicia • Nuestra historia de bebés!

Anyone know why the cover line appears? Normally I don't have it and yesterday it appeared, also Glow marked that it was a day away for my period and now its10 days (and I have all the symptoms to have it like today) and obviously also moved my fertile days ... it frustrates me a little, because I consider what the application says and my temperature to try to get pregnant and suddenly all changes.

We have been already trying for over a year. My husband has varicocele and poor sperm morphology. .. So every bd and calendar date counts.