Light Period? 🩸

I’m 11 days late and on the day of my expected period I started having brown discharge. The day of my expected period was 9 DPO. It’s come and gone throughout the day and is brown and light pink, mixed with a liquid CM. I don’t need tampons or pads. I’ve never experienced anything like this before (as my periods are usually only 7 days and very heavy) but, have gotten multiple BFN. I have 2 children so, I’d like to think I know what being pregnant feels like 🤦🏼‍♀️. And, I feel pregnant. But, I’m so confused!

Has anyone spotted for this long and actually been pregnant? This seems uncharacteristic of implantation bleeding though, I’ve never had it.