This may sound a dumb question. FTM

I am 15w3d pregnant with di/di boys and i have start to feel some little kicks (wich i am sure its not gas,either muscular spasm,cuz they feel different). But i feel the kicks only on my left side. On my right side more rare. So my dumb question is. Are they supposed to be one in left side and the other one in the right side? And i am feeling only the one who is in the left side???

Also at my scans,one of the babies was all the time moving and kicking all around and the other one just chilling.

Does this makes any sense? Please give me some answers. TIA.