I am going on holiday in 2 days and my period has started when not usually due, is there anything my doc can prescribe to stop it ? or any advice

Continuous OCPs: The menstrual cycle is sensitive to many things (weight changes, stress, medications, etc...). Depending on the reason for the procedure, this may need to be evaluated asap. For now, it sounds like you should keep a strict menstrual diary and follow up with ob/gyn, if symptoms are persistent and/or worsening. In the meantime, you may want to suggest a continuous OCP regimen.

Let it flow: First, not all vaginal bleeding is menstrual, so consult your gynecologist. 2nd, I hope this on its own would not spoil your vacation. 3) and maybe most impt.: It's better not to intervene with drugs before you get a diagnosis.