Girls, hello? Could you please tell me how not to give birth earlier …

Girls, hello? Could you please tell me how not to give birth earlier than expected? What movements should I avoid? Or maybe there are some products I shouldn't eat? I'm very afraid of this because I haven't signed a contract with a paid doctor yet (she says it's early by the deadline) and with my lifestyle everything could be...? Thank you in advance for your answers ? Take care of yourselves and your kids??