Oh don't worry too much, mama! From what I understand, normal AFI range is around 5, 25cm at this stage, so 6.7cm is technically still within normal, just on the lower end, a few of us in my mum circle have been in similar "borderline" territory near full term and went on to have perfectly fine deliveries. My friend actually had her AFI fluctuate between 5.3cm and 8.7cm across several weeks in her third trimester, and she said her doctor just monitored her more closely and everything turned out well in the end. Since you're already scheduled for induction on 15 March, your doctor is clearly keeping a close eye, which is really the most important thing at this point. That said, do bring up your own gestational age calculation with your OB too, because that week or so difference could matter for how they interpret the reading, better to have that conversation openly with your doctor or specialist who knows your full case!