Filling a pad with dark blood after membrane sweep?

Doctor did a membrane sweep today... I'm 3cm dilated & 60% effaced. Baby is at -2 station. I am 38+3 weeks and this is my 3rd child. I didn't have it done with my others... Would filling a panti liner with dark blood be a concern or is it normal? Dr said a little spotting is okay but this was more than I expected.

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