Implantation bleeding

Yesterday while I was at work I started having mild cramps and I didn’t realize until I got home and use the restroom I had what looked like a small amount of pink blood. My period is supposed to start between the 27-29 that’s what both of my <a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation apps</a> say. Does it sound like implantation to you ladies ? I also took a digital test today and it came out negative. I’m either 8 or 9 dpo.