Nub Theory help

Hi, I'm new to this site and need some help with nub theory. I've had my 12 wk scan and have been googling nub theory. I've looked at my pic and I can see two lines one near the genital area up from the spine and one closer to the belly. Uploaded my scan pic can anyone help please??Which one is the nub??Attachment 30909

Lower near where legs are/would be-- not sure I can make this one out.

Nub isn't visible in this pic.

Thanks everyone for your help I will just have to be patient and wait until September ����