I am wondering does this look like it could be IB (implantation bleeding)? I follow 2 apps the <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> is usually off by a day or so and the other one is spot on usually. Well yesterday glow sent a message saying my period starts today and it showed on the calendar to start on Friday, while my other app says sunday. I have been 27 day cycles for the past 6 months. Well just so happens last night I had pink spotting and today I have it. It's not a lot but it's stayed pretty consistent and hasn't gotten heavier. So does this sound like it could be IB?? I'm currently on Cycle Day 25.