Implantation bleeding?

Kristen • 28, married, TTC our rainbow baby #1 🌈

If you’ve experienced IB, how long did it last and how late in your cycle did you experience it? AF was due 3 days ago, and I’ve had very light brown spotting off and on for the past 2 days. Not any heavier and not bright red. I’ve also had a lot of heartburn and dizziness, but I tested this morning and it was negative.

Thank you ladies 💕