how many weeks + days am I?

[Autumn2014]

I go for my first tri scan on Monday and want to be sure with my answer if they ask me how far along I am compared to the scan estimate. My lmp was 29 July, so how many weeks plus days will I be on Monday? Thanks

You'll be 12+5 on Monday, assuming 29th July is the day your last period started. The 12-week dating scan often changes your due date, though, so if they do that there will be a corresponding change to the weeks/days.

Hope all goes well, and congratulations :)

Your 12+3 today by my counting.

The others are right. 12+3 today. However, the LMP date is only a guide to arrange care around and once they have your scan date, if it varies, they'll just alter it anyway. Your LMP will be on their notes too so they won't need to check with you how it translates as it'll come up on their computer when they enter all the relevant information.