Hello

I hope I get my confusion solved regarding my 19th week ultrasound.
At the moment I am 14 weeks pregnant. yesterday my GP gave me referral for 19th week ultrasound.
I read on several pregnancy forums it should be combined blood screening.
My GP told me Midwife would guide me when I rang my Mid wife she said you have already doneblood screening at 10th week you don't need at 15th week.
does this mean its ok to have 19th week ultrasound without blood screening?

I appreciate your advice.
Thanks Nim