Girls, can you tell me what to do if the contractions are strong, but the…

Girls, can you tell me what to do if the contractions are strong, but the cervix is not ready yet? I went to the maternity hospital twice today and was sent home both times. Now the contractions are even more painful and with an interval of 4:1. While I'm lying in the bathtub, it really helps with the pain. But what should I do next? When should I go to the maternity hospital? And what should I do if the cervix doesn't open on its own?