Evaporation line, never heard of it.

E

So i got my period last month but it it only lasted 4 days, it has never been that short.

I got a notification from my fit bit i was supposed to get my period a week ago , Glow says in 4 days.

I'm not sure because it was off and not calculated right last month.

So today I took a test and 8 hours later I check it and see this.

When I first took it I quickly looked and seen the faint negative.

I then googled, is it valid after 8 hours, then read evaporation line🤷🏽‍♀️ So I thought who better to ask then the Glow Gals.

Is this invalid.

Ttc for 4 years now i have always done this, I go back and look at the test hours later and have never seen this. It always stayed negative.

I only have one ovary and have had three miscarriage,so I'm so nervous.