If you still do not feel reassured
You are allowed to call again. You are allowed to ask for the advice to be repeated, explained or escalated. You do not need to wait if something feels wrong.
You could say
“I understand it may be early labour, but I am in severe distress and I do not feel safe or reassured managing this at home. Please can I come in for assessment or speak to the senior midwife?”
If things are changing quickly
“I am worried this is progressing quickly. Please can you explain what would mean I should come in now, and what I should do if things change before then?”