VERY confused after first scan

[Purplecatti]

OK, so I will start at the beginning.
I found out at the end of February I was expecting, basically I realised I had missed two of Aunty Floe's visits, first due thirdish week of January and thought I'd better pee on a stick. After it came up positive and a massive OMG what have I done response complete with 'I can't do this' and 'what do I do now, the world is falling to pieces' (it, wasn't, I was being the drama queen that I am) I began to come to terms with it. Thinking about it deeper I had maybe a day and a half of spotting at the end of January and a bit more second week of February.
I checked my own dates on an online calculator which said 25th September.
After a couple of weeks of faffing I saw a MW who gave me the date 11 September.
So when I went for my first scan today I thought I was around 16 weeks or a bit under.
After seeing a very mobile little thing waving little arms about, clenching fists and wiggling fingers on the screen at the hospital I was told firmly that I am 11+3 and due 22nd October.

I have stopped being sick last week, chest is bigger but not as painful as it was, this stopped last week. Bloating has all gone down, I look almost normal apart from a cup size up.
But I have been growing reams of new hair since the middle of January, by the end of January I had new tufts at my temples about 2 inches long.
Since beginning of Feb I have had period type pains until three weeks ago and felt exhausted, fluey and PMSey until the middle of March too.

I just can't get my head around it.

I could be perfectly happy with being wrong of a week or so but a whole month out?
How did I get it so wrong? I've told people as I thought it was time and it was going to be pretty obvious in a couple of weeks and now I'm worried and feel a bit stupid. Even more so then when I went to the Drs saying I think I'm 10 weeks gone.

Hmm - what dates did you use in the online calculator? Did you have a reliable date for the first day of your last period?

What did the MW base her calculations on?

THe scan is likely to be the most accurate but I can understand how confused you'd be for it to be SO different from what you thought.

Didn't take a note of the first day but finished the week before christmas and they are always 6 or 7 days long so I counted back.

The scan is going to be right. The difference between an 11 wk old and a 16 wk old is MASSIVE. There is no way they would have got that wrong.

Only you know your body and if you could have effectively skipped a period as it looks like this is what has happened.

You conceived around 9.5 weeks before the date of your scan. Perhaps you can work it out using that as a guide?

I thought i was 2 weeks further than i am, it turns out i got my bfp when i was 3 weeks gone, i hadn't missed a period, they were all messed up as i'd only just had a baby !! I think its quite easy to be confused, you can ovulate later than expected etc

this happened to me as i was on the pill so i didn't have periods

was given a edd based on my lmp for january
scan date gave me march, i did give birth in march

try not to worry

I know pretty much the date on which I conceived and got to my scan thinking I was 12+2 only to be told I was actually 13+2 so I wouldn't worry. Scan date will be the most accurate. Think it is even more accurate once you've had your 20 week scan too.