What is this?

I don’t get my period until 2 weeks from now and I have missed a few birth control pills but I’ve also been having unprotected sex. I got off my period on the 29th and started having unprotected on the 30th of May and I’ve missed a total of 6 pills from then until today (April 12).

There’s no clots, light cramping, and last night it was way lighter than this color. I took a pregnancy test 2 days ago and it was negative.

Could it be implantation bleeding?

Could it be breakthrough bleeding?

Or did my period just come early?

Please help!

Update: it stopped. The bleeding only lasted a day. What does it mean?