Thanks everyone for your honesty.
I am basing my dates on my LMP but I really have no idea when I ovulated. I wasn't testing and I wasn't taking any medications.
I have previously used clomid for other pregnancies and was charting temps and using OPK's.
This pregnancy was a complete accident, a natural pregnancy.
I'm not sure why I thought this pregnancy would be any different. I think I thought that because it happened naturally, that is was meant to be??

There is a slim chance that dates they are suggesting could be possible... but it's a long shot. Maybe I'm just clutching at straws??
We BD twice, first at cd12 which is when I was assuming I concieved. We also BD and again at cd24.
I POAS 29/12 (cd35) when I assumed I was 5w and 22 days post ovulation, based on my LMP and luteal phase of 14 days. It was a really strong pos (which I haven't had before, because I am normally POAS from cd28 and is a faint pos). So I assumed that 5w made sense. Based on scan dates on the I would have POAS at around 10 days post ovulation and got the strong pos??
I have always had a 28-31 day cycle so I had just ruled out getting pregnant on cd24, but it was only my 2nd cycle after Lucy so maybe I was still out of wack?

Still the only way we will know is by the 2nd scan. I just received a call form my FS rooms and they want me to have the scan in 2ish weeks with my FS, but she is completely booked out. They are going to try and squeeze my in on the 20th, but will call me back on Monday when my FS is back from leave.
So 8 more sleeps to ponder the what ifs...

Thanks so much for everyone's support xx