Calculating weeks

Lea

Ok, I know it’s best to wait for the ultrasound but I can’t go until 1/22. My LMP day 1 was 11/26. My average cycle is 31 days. I have different apps and they range from 6w 1d to 6w 5d. I’m driving myself crazy trying to figure it out to give myself more piece of mind with lab numbers and miscarriage rates, etc. what do you all go with??