Implantation spotting or start of period??

Hey all. So I’m supposed to be starting my withdrawal bleeding. I’m on birth control.

However this looks way too light and pink for it to be the start of my “period.”

Last Monday - Wednesday I was dizzy and tired intermittently. That stopped though.

Wednesday I got into a car crash that was pretty severe. Got some injuries from it. I’ve had lower back pain ever since that’s also radiated into my legs and stuff, but now I’m scared that it may have been implantation cramping. I’ve had this pain in my back pretty consistently for the past 5 days.

Boobs feel PMS like at the moment.

I tested Friday and it came out negative so now I don’t know what to do or think now. HELP!!!!!!