Anyone have this happen ?

Jill • Married to an amazing man. Have a beautiful handsome baby boy. Baby #2 is on the way.
Had a miscarriage in February, and had my period come near the end of March beginning of April. 
My ovulation window according to glow doesn't start till Saturday. But me being odd I decided to pee on ovulation sticks yesterday and this morning figure start early so I don't miss it. 
Well this mornings test gave me a positive but I'm not even in my fertile window.... Anyone been thrown off or ovulate early ?