Transvaginal Scans

[user1490882644]

I had an early dating scan today, I had a rough idea of dates but as I stopped taking the pill when my last packet ended I couldn't be sure when I ovulated.
My LMP was Feb 6th, which put me about 7weeks 3 days gestation.
At the scan today the lady couldn't see anything with a normal ultrasound so did a transvaginal scan, where they put me at 5weeks 5 days. I could see a tiny black mark which she said was the heartbeat.

If I'm right in thinking that to find the date-ish of when I conceived I should subtract 2 weeks, would I only actually be 3weeks and 5days?
Also, does anyone have any experience with these type of scans and how accurate they are?

No if they said you're measuring at 5+5 then what's what you are. You're classed as 2 weeks pregnant when you ovulate so when most people find out they're 4 weeks pregnant already. You can take about 2 weeks off to work out when you ovulated but that doesn't come off how far gone you are. Does that make sense?

Vaginal scans are more accurate early on!

I had several vaginal scans early on as had a few problems and they were very accurate. 24+2 now.