Implantation bleeding

Brittany

So according to the app I’m 4weeks1day. I started to have some light brown spotting yesterday and today it’s a little heavier. It’s definitely not my period but it’s brown and red and sometimes when I wipe it’s like stringy brown in that makes sense. It’s also followed with lower back pain. Just wondering if anyone else has experienced this. Today would be the day of my normal period too so I’m like anxious of course.