Implantation? any advice would be great

Starly • Married, Mommy of a 4 year old, ttc baby #2

So the beginning of this cycle I bought a new BBT thermometer, it has a history feature and I thought that's what I was reading nope for some reason it always has 97.7 on it as well so it wasn't until CD 10 that I figured that out so from that day on I recorded my actual temps.

I confirmed ovulation through a CB advanced digital and ewcm, I'm on 6dpo and I got this little dip in my chart.

Could it be implantation or is this usual?

Please help