Never, ever felt them appear(and I've got enough, especially since last pregnancy, but got first ones when I was 10)
I'm 35 wks. Last night I was in the kitchen and I just felt this sort of prickly, pins and needles sensation across my tummy. Very 'ouch'.
Had a look, and lo - new red stretchmarks that weren't there previously. Like my skin just gave trying to hold itself together
Just having a whinge really. Shall keep slapping on the bio-oil and hoping it doesnt get much worse...