Need help

So this cycle I started using clearblue advance fertility monitor. My LMP was 1/7/20 my peak days were 1/21 and 1/22! I can never get a positive until after I’m days late. Here’s my question. AF is supposed to be here tomorrow or Thursday. 2 different apps 2 different days lol. This morning I started spotting. Light pink only when wipe! I have never in my life spotted! My periods are horrible so I don’t believe this is the start of AF. Could it be implantation bleeding?