Pregnancy Symptoms

Ciara
I usually don't start until the 13th. But Glow says it's due today. Last Night I had a horrible Headache 28th Blurry Vision. And today the Metallic taste in my Mouth is back. And I've been craving Pickles and Eggs. I want to wait until I miss my Period that usually comes before I Test. I got a Positive Ovulation Test on December 22nd. So I don't know if Glow is wrong or right?