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

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?