When to test?

Amber • TTC baby one
To make a long story short... I'm about 4 days late and I have some SUPER faint if not negative tests on the 10 and the 12. According to 6/8 of the apps i tested I was set to start the 9th. One app said the 8th and another said today. I'm super confused. Last time I was pregnant which sadly ended In a miscarriage in April of 2015 I was 5 days late with a strong positive.