Faint line and negative test.

Alright gals,

So on February 11th I made a post about possible implantation bleeding and most of you said it was impossible to tell if it was indeed implantation or AF. Well I only had a light pink blood when I wiped. Since then I have had the worst heart burn ever and just little cramps here and there. My breast were tender for a day. On Valentine's day I took a test and it was a vvfl (image attached below). Then the next day I got a negative test. On the 15th thats when AF was due. It is now February 20th and still no AF. Should I test again? What if that comes back negative? This is my first cycle of trying to concieve my first. Im new to this help me out girls!?!?!?!?!