Is this Bloating or something else

Hello all would be moms! Hope u all r doing fine 😃 I have completed 25weeks of pregnancy and now at this stage my belly is becoming very hard every now n then and I feel very less baby moves after this. I asked doctor she said it is just gases and nothing else. Is really just gases? Because during my first pregnancy I didn't experience such things so I am a little confused why my belly is hardening though my baby is all fine in there. Anybody is going through this situation? Please comment n guide me!!!