Did dr give away gender?

Just looking for opinions as I will have my answer a week from now! My SIL is planning a gender reveal next Friday! She received the gender results from my NIPT test.. I had my 12 week ultrasound today and the Dr had to come back in and get an additional measurement, when he did he made a comment “and yep looks like girl parts”. I acted surprised (which I was! I have 3 boys and definitely think I’m having another!) when I told him about the gender reveal he backtracked a little and said it’s too early to tell gender via ultrasound. What do you ladies think? Did he spill the secret? (Note: I am totally ok if he did haha this gender reveal is way more for my SIL, MIL and mom!)