Implantation cramps!

Who has experienced implantation cramps?! What do they feel like?

I'm about 8/9DPO, depending on what OPK I go by, and tonight I felt fairly sharp tingling kind of cramps for about 2 mins and then they were gone. It was a weird feeling but wasn't super painful. It definitely wasn't the dull, fairly painful cramping I'm used to with AF.

I've been testing.... all negatives.

TWW sucks.