Am I really 6 weeks pregnant, or am I 4? 🤔

Question

The beginning of my LMP was 26th December 2017 and only lasted around 4 or 5 days. My husband and I BD everyday after for 4 days then every other day. Everyone's saying that 9th January would have been too early for implantation bleeding? But I've never had an ovulation bleed before, or anything of the sort happen before. So I believe 9th January 2018 was possibly my conception date. I got my first BFP on the 25th (the day of my supposed first day of period however the line wasn't that light, neither too dark. It was a blue dye.) and this was it:

I'm due October 3rd. Everything signals me to currently being 6w 2d, but Baby can't possibly be that far developed? I must only now be 4 weeks? So... should I be looking at my baby's development of 4 weeks now rather than 6?
I also have my first ultrasound on the 20th when I am '8 weeks' but technically I'll be exactly 6 weeks. Will anything be seen? I'm just worried that they may say that my pumpkin isn't the correct size and then tell me it's possibly not a viable pregnancy when in actual fact, I could possibly be 2 weeks less than they thought?
This test was just over a week ago:

Answer

I last month period Was on 29 December and I’m six weeks today due oct 5th 😍😍

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It goes by the date of your last menstrual. Technically a woman is only pregnant for 38 weeks, the additional time is the 2 weeks before conception. So basically the time the your uterine wall begins to collect blood again and hormones are being released to mature an egg for release. My dates are exact with yours and im 6 weeks.

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So crazy you posted this. Our numbers are almost exact.  My lmp was 12/27-1/1.  All charts/apps say ovulation should be around the 9th. (Bd during the right times).  I have got a positive test on Thursday 1/18 I called my doc that day and got bloodwork done on 1/19. (I had a mc in August so I called them right away to get bloodwork to check progesterone levels asap).  I had my first visit with them which I would have been “4 weeks 1 day” only saw thickening of my uterus and got my results of hcg was 9! He said like hours pregnant.  So I went the following week “5 weeks 1 day” and saw a tiny tiny spot starting of a sac and hcg levels went up again.    Now I just went Wednesday at exactly “6 weeks” and the sac is actually pretty big but nothing inside. It’s showing progress. My doc is thinking I ovulated later than I think and not really 6 weeks (or at least he’s giving the benefit of the doubt that’s what’s going on) I go back again in a week to check. Im so sacred and have been a nervous wreck since yesterday. He had me go for bloodwork yesterday and today to check levels again to see if they are still going up.

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I have a baby bump app and this is what I got based off your LMP December 26,2017 , it gave me October 2,2018 as your due date 6w 4d

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my lmp was 12/26 as well  except ovulation was on the 1/10. you're not going to have implantation bleeding the same day you conceive.

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You’ll never know until your first 8 week dating scan. Don’t over think it until then x

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like i found out i ovulated late...my last real period was december 9 due would have been sept and i would of been 8wks...but i was getting negative hpt...but i missed january period too...then i did another hpt 2 days ago it came positive so now im 4wks and due date is in Oct...so maybe u just ovulated late.

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The ultrasound gna be the only thing to determine it. Because i found out and i was 8.3 weeks when i went to dr so i thought maybe the baby was gna be around 7 weeks. Well the baby actually measured 8.6 weeks, so was 3 days ahead i was shocked and happy!

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My not I lol