Any of those days tbh, there's no way of knowing exactly which time it was.
@Riley sperm from the 11 august could this of lead to my pregnancy? This was 2 days before my period
No not the 11th, the days with the hearts on
if it was the 11th you'd be measuring at a longer time.
any of those times could have been when you got pregnant as sperm can survive up to 5 days. but either on the 25th or 26th the fertilisation occurred.