Mo\Di or Di/Di twins ultrasounds

Brittany

Hi! I go back at 12 weeks to do NT scan and hopefully find out what type of twins I’m having but curious if anyone can weigh in. Based on every other ultrasound I’ve seen they appear to be mo/di twins to me but my doctor said it’s too early to tell but there appears to be a membrane separating the two. This was at 9week 1day.