Signs of early labour ?

Currently 37 weeks exactly with Baby number 2 . Completely different pregnancy than my 1st , I’m experiencing different pains etc so I struggle to identify what is normal etc .

I had whooping vaccine 3 days ago so I don’t know if this is apart of it , however today I have been extremely nauseous , unwell , tired , irritable and just off . Last few nights worth of sleep has been next to nothing , And I have been dead sleeping for a few weeks now . My lower abdomen is crampy occasionally but not all the time , and I have heard a loud pop twice now from my stomach . I feel like Baby has gone from 3/5 engaged back to transverse overnight , Baby has been moving non stop and I feel my stomach being a lot harder across ways rather than down . Also some movements really hurt and I can’t recognize if they are contractions or long hard movements . Anyone had similar experiences ?

I’m so over it and I’m just super sensitive 😫😭😭😭