Nub theory. 13 weeks

Alannah • Wife and mother of 2 boys 10/02/13 and 03/09/19 and 1 princess 05/17/21

This is my cousins ultrasound she's 13 weeks measuring 13 weeks 5 days. Does anyone have any guesses. These are the only pictures she has and she enhanced a couple since the originals were hard to read.