Faint lines but AF started

sarah

I am 15dpo and have been getting VV faint lines on pregnancy tests the past few days. I got my AF today (3 days late). I don’t think it’s implantation bleeding as I have read the implantation occurs around 7-12dpo. Why do I have faint lines but still started AF? Could this be an early miscarriage? 😭 it broke my heart to see my AF this morning. We’ve been TTC for 11months now.