AF is 6 days late

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Ive been having this and light pink spotting since yesterday morning. Could I be implanting late? Ive been bloated, have sore boobs and have gained weight.

I've taken a test yesterday morning and it was negative. What could this be from? I'm never late