Can anyone help?

Kelsey • I thank God daily for my blessings. Amazing husband, handsome 6 year old boy who gets a new brother due 6/11/16. 🙏😍🙏
I need help with the nub theory please, if you know how it works. Can anyone let me know their input? Thanks so much! These were taken this morning at 12 weeks 4 day. 😊