I am aware each pregnancy is different, goodness nows all 3 of mine were.
That being said, again, speaking for myself, knowing the risks of the placenta becoming less and less viable ( did I spell that correctly? ) would worry me.
I would not be comfortable going past 41 or 42 weeks. I know exactly when my children were conceived. I have always been very sure of my dates.
I would be worried if I were in the OP shoes.
Support of a choice is not all or nothing. It is about knowing what the risks are, understanding and being willing to deal with the outcomes.
Offering the suggestion of going to a trained health care professional is just as supportive as offering " good vibes'.
I, just happen to think my advice is better.Again, IMO.