How did you know you were in labor??

Hey all so I’m 31+2, second pregnancy but first time giving birth. Just curious to know what labor feels like and how contractions feel so I’m more prepared and know what to look for! Very nervous about the whole thing as I haven’t had any major surgery type stuff so this will be he biggest thing I’ll have to be hospitalized for but just so excited to meet our rainbow little girl!! And any advice is well appreciated, TIA!!!