Confused with dates. Positive 4 days after conception

[user1497125747]

Hi everyone really new to this but I've been reading mumsnet for years and trust support and advice from here.

I am 15.3 weeks pregnant, my problem is with conception and scan dates. I tested my first positive 14th march but my first 2 scans, early reassurance dated me 10th march, since then my 12 week scan moved my conception date to 8th march. Even this 6 days after conception seems way to early to be testing positive.
I also done a cb test on the 27th march which came back 3+ which would of taken me to at least the 6th of march.
The reason am so worried is I had unprotected sex with someone else on the 10th of March. He did not ejeculate inside me, but am fully aware there is still a pregnancy risk. I know this sounds awful but it was wasn't planned and not one of my best decisions which I now deeply regret.
Any help would be appreciated. Lots of information, thanks for taking the time.

You will require a DNA test after the birth.

Think that's pretty obvious but thanks for replying. The question was more reguarding the possibility of getting a positive 4 days after sex which I thought was impossible due too x amount of time implanting ect.

No way you could get a BFP only 4 days after conception. Sorry if that's not what you wanted to hear.

Average cycle 28 days
Average ovulation day 14
First chance of a positive would be at the very earliest 8 dpo so day 22
First response would detect 6 days early
Scans allow for the travel time of embryo and implantation time.

No way would you get a positive 4 days after sex!!
Work out which days the above list were for you and when the sex with each man fits into your cycle. .
Or confide in your mw.
She won't judge you.

That's exactly what I wanted to hear, thank you. It's a really long complicated story but thanks for your help and not judging. I've been worried sick and I can't enjoy being pregnant. I had sex with the 2nd man once and he didn't come inside me and I received my bfp 4 days after that incident and before that I'd been with the same person for years. It was just so confusing when the first two scans gave me that date ! I think I logically no it's not possible but it's worrying.

My periods are all over the place so I can't judge anything on that. They have moved the date to the 8th which is obviously 2 days before this incident but that still means that I got a bfp 6days after I conceived. Nothing makes sence

If you've had unprotected sex, you'll need a check for STDs.

I hope you get the answers you want.

I've had one all is good thank you 🤗

If you got a positive test on 14th it was not the guy from the 10th.

Thank you oysterbabe, I thought myself it's too soon, just feel like I need reassurance. Thank you 🤗