Curiosity is killing me!

I have 2 kids...I really want a third...we aren't using protection, not using ovulation predictors.

I started my last period 10 days late-which is likely because I synced up with a female friend of mine that was over at my house a lot that month...I noticed ewcm on cd 15, which would indicate ovulation, I checked my cervix which was soft, high, open, and wet...we had had sex 2 days prior to that.

According to one of my tracker apps, I ovulated that day. Now, 8 dpo, I'm cramping so bad and af isn't even due for 6 more days...is this a sign of implantation?? Could I be pregnant??