An ultrasound at 6w2d exactly matched my regular 28d cycle, charted (sympto thermal) ovulation date, and the night we ruptured a condom!!

I am VERY sure of the dates for this pregnancy.
I understand, I'm not looking at 13lbs...but possibly over 12lbs by 40 weeks. I was not thinking monsterously huge...My title was more to indicate that I have a high degree of trust in these estimations for weight (for many arguable reasons, which I was not interested in debating) ie. Assuming it is true that he is big...induce, or c-section?
9 1/2 lbs at 36 weeks
is very big...off the top of the chart big.
Since my largest babe to date was only 8.5lbs (and I worked HARD for him), 11lbs is as large as I will attempt. My intuition will not stop bugging me when I am considering a weight above 11lbs...But, I
really would like to deliver vaginally.
My mother, mother in law, and various sisters in law on both sides have all had babes in the 6-8lb range, at term, spontanious labor. Within the sphere of personal experience and history there is a norm and an outside of norm for an individual.
My question is, what order do the risks of my various options fall into?
Is it better to
A. induce+deliver earlier, risking induction and lung and liver maturity,
or B. carry untill I go into active labor, but have no confidence in my ability to physically deliver because of my son's size and opt for a c-section,
or C. trust that the moon stars and my pelvis will line up in such a way as I'll be able to vaginally deliver him (without injury to him or serious injury to me) no matter what his head and shoulder measurements may be?
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