Membrane sweep?

Sy
I am 39 weeks and would like to ask my doctor to perform a membrane sweep at my appt tomorrow. If she doesn't offer to do it, is it appropriate to ask? I've been dilated to a 1cm (hopefully I've progressed, won't know until tomorrow) and have been up to 75% effaced. I've also been having contractions on and off the past couple days. I just want to know if it's appropriate to ask. I don't want to seem like an idiot. 

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