40+2 weeks and extremely tired and weak

Ive been having a really good pregnancy im now 2 days overdue and im a ftm ... i woke up this morning feeling like i have no energy what so ever ... i feel sorta feel weak ... i ate so,e toast n had a smoothie and still feel very tired .. i had a good sleep so would this be concerning ? When should i page my midwife ? I usually have energy and feel pretty good but this morning is different