NIPT (inconclusive)

I’ve had two inconclusive NIPT results and I’m curious if anyone had the same and baby was okay?

My first was drawn at 12 1/2 weeks - 3.1% fetal fraction

My second was drawn at 16 1/2 weeks - 2.8% fetal fraction.

I have lost 21 pounds, and I’m 199 pounds and I have a lot of muscle. All the charts I look at for weight effecting results the weight bracket is higher. I also am concerned as to why my fetal fraction has dropped in a months time when I’ve lost weight. So I think weight is not a factor and I’m really starting to worry something could be wrong. We have an ultrasound Wednesday but I’ve been stressed for the past 3 weeks and I’ve found no answers so looking for some insight. Thanks!