I gather if i had conceived on 24th march (or five days following for usual sperm life) my ultrasund dates would be different or CRL sizes different?
My worries come from reading about so called 'super sperm' that can live for 2 weeks although i assumed this was under perfect lab conditions and not through a period etc... the internet can be a worrying thing (as can answers like mr wine expert above)
I know that i def did not ovulate until after 4 april due to my ovary U/S and so there is little likelihood of sperm hanging about in my tubes until my egg was released? Paranoid i suppose and scared.
Thankyou for your help and reassurance J_9, it is much appreciated