Implantation or AF? TMI

Shelly • Wifey and Mumma. Justin, Baylee, and Amelia.
AF was due 4/28..maybe? First month post Mirena last cycle was in January. Anyway, no sign of AF then tonight I had very light pink almost see through when I wiped. AF usually starts full force. Never confirmed ovulation. Just have my fertile window for glow. Anybody ever had late implantation? And how long should I wait to test? TIA!