I think this is it!! Am I in labour??

Kerry

Been having, what I feel like are contractions all day from 4am! It's now 10pm! They've been regular throughout the day & in these past few hours have become about 6 mins apart. They are manageable pain wise though, although I'm now using a heatpack & they're getting a little more intense (still manageable!). When should I be contacting the Midwife?? When the pains are unbearable/can't talk through them or before?