light baby pink

Katy ttc our 🌈 1πŸ˜‡ Thomas Allan Herron 7.16.19 β€’ Angel Baby 7.16.19 to ruptured ectopic at 8wks

so today im 9 days late and AF is always on time...was going to test for my bfp tomorrow, but i just went to the bathroom and when i wiped there was a pale baby pink discharge almost like spotting before my period starts( started happening 4 hpurs after our nightly session)...could i still be pregnant? is this implantion bleeding? whats the difference between bleeding really light and implantion bleeding anyways how can i tell the difference?