Obs are all different so there is no definitive answer. I think most low lying placentas should be a 'wait and see' approach. Know examples of this going both ways when waiting and seeing (i.e. vaginal birth and c/s after bleeding started), you never know what the placenta is going to do. 20 weeks is way early yet. You have read the BB article I assume?
If you want to see how placentas move, get a balloon, blow it up a little, say like an orange, draw a smiley face on it at the base and then blow it up all the way, see where it is then
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