What is going on?

Meg

September 15 (Saturday) I took a hpt first pee was negative. That afternoon I started my what I thought was my period, the next day Sunday September 16th I had a pad on and a tampon in and when I took the tampon out there was just a little light brown spotting. And that was it. My period always lasts 4-7 days. And today September 25th I had some light pink blood and egg white very stretchy cm and cramping. Can anyone explain what is going on?