Could I be pregnant?

My period was due to start today February 10th. On February 6 and 7th I had light brown and pink spotting . And usually I have this before my period then my period follows but this time it just stopped. I am having no spotting or anything . I am on LOW DOSE birth control ... is it possible that I was experiencing implantation bleeding ?

The days with hearts are when I had sex . And the 6th and 7th is when I had the light brown and pink spotting .

Also on the 22nd of January I had light brown spotting which is the day before I was predicated to ovulate ...

I took a pregnancy test on February 10th and February 13 both negative but they were done at night.

Today I am experiencing light cramps and white discharge ...