Dating scan & they put me forward!

Lauren • 31, partner is 35. We have three children, William 10, Georgia 2 & Eliza just born. I work with domestic abuse victims in the north east of England. Partner is a roofer/joiner.

I'm 12 weeks 6 days today, so 13 weeks tomorrow. Brought forward to being due 9th may, but will be born before or after 25th April due to previous issues.

According to nub theory this baby is a girl, so I'll have a 10 yr old boy, 2 yr old girl and a new born girl. (If its correct) I'm 99% sure this baby is a girl tho! Next scan 20/12/2018!