Trying to calculate dates - any ideas?

[Maraudingmarauders]

Hello,
I've just got my BFP after 6 months of trying, which is both wonderful and terrifying (first pregnancy).
I took a test today because I've been feeling nauseous for the last two/three days, and super sensitive nipples. Used clear blue (lines not words) and within seconds got a big dark line. Tried again and got the same (same urine sample). So looks pretty set it's positive.
However, I'm trying to work out my dates and I have no idea.

I have normally a pretty regular 29 day cycle. Over Christmas I was 5 days late - I was certain I was pregnant, but I tests on that 5th day and got two negatives on clear blue (words). Used first wee of the day etc etc. Got my period that evening. But instead of a normal quite heavy 5 day period, I got a two day light bleed. So maybe implantation? But then I would have expected to test positive by then?
I'm now only half way/2 thirds through this cycle ('period' technically ended on 1st January) so I wouldn't expect to get such a strong positive this early, in fact I thought I was being silly wasting a test doing it!
You guys are whizzes with ovulation days etc and I just have no clue.
I'd started doing ovulation tests this month for the first time, but felt they weren't working as my score kept coming up high each day (1.9-2.2) and not coming down....

If that light bleed was implantation you wouldn’t have tested for a couple of days after as it takes time for hcg to rise.
the clearblue digital, assuming it wasn’t the early test, is sensitive to 25, so it wouldn’t of picked it up anyway.
sounds like you ovulated late last cycle based on your AF being late, but still managed to catch that egg.

assuming you implanted on 31st December, and conceived around 10 before that, I’d hazard a guess that you’re around 6-7weeks pregnant.

congratulations

Thank you @Mannymoomin that's very helpful.
To add.to that I've just done a clear blue words and it is coming up as 3+ so must have been last cycle.
Weird to think I can be that far pregnant! Also annoying as I drank happily over be years as I'd tested negative and was bleeding... Oh well, nothing I can do now!

*New Years

Hi Op, when would your period be due?

Around 25th January