hard feeling in my lower stomach

I been rubbing my little bump everyday and all day today, I felt this hard spot on my lower left side of my stomach close to my hip bone but  towards my private (lol) and that's where I feel little kicks was wondering is this where the baby's at? with my previous pregnancy before I would play with my baby do little taps and play music and this time I hardly feel anything and I'm to the point of think it's just my body doing twitches! this is my 2nd so I do know my differences from flutters, kicks and etc.