when was the right time to go to the hospital

Hi momshies, ask ko lang po kung kelan po ba yung right time to go to the hospital. Kaninang madaling araw pa po kasi sumasakit sakit tummy ko. At first medyo malalayo yung agwat then nag llast lang sha ng about 30 to 1minute, but around 6am this morning mas maliliit na yung gap ng sakit.. nasa 5 to 8 mins nalang yung interval. Last check up ko yesterday and 2cm na daw ako as per my OB. Thank you