UK ladies - 12 week scan??

Ashley • 🇬🇧 26 - pregnant with baby no. 2 ✨ Mama to one gorgeous little boy born 13th December 2018 💙

Basically Whats the earliest gestation are they able to perform the ‘12 week’ scan to get the measurements they need? I’m worried I’m only going to be 9/10 weeks! I know the latest it can be done is 13+6 but don’t know the earliest and at what point I would have to return for another scan closer to 12 weeks..

So I’ve had my first booking in appointment with the mw yesterday and I’m now waiting for my letter for my 12 week scan, from my period I’m due 27th of June making me 10+6 but I’m really irregular and I KNOW I ovulated around day 30 of my cycle because I track using opks and I also know I can’t of conceived at day 14 of cycle because I didn’t have sex any time around that point in my cycle 😂 I told the mw this and she wasn’t really interested 🤷🏼‍♀️