6 days late when should I test

Brittiany • He still gives me butterflies and I love his life can`t wait to birth his seed
Soon... I'm late and checked my cervix last night and it was dry I guess... But I put my dates into a <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">due date calculator</a> and it's saying I'm about 4weeks along... If this is true my due date will be July 22,2016 which is the day before my SO oldest son's birthday