Sorry if this is in the wrong section but I don’t know where else it would go where I may not offend anyone!

Please no nasty comments it’s just general question

So I’m 17+5

I’m just abit confused on when I would of had sex to conceive if that makes sence

So I had my period from the 14th of august to the 19th but according to my 12week scan I had that’s the day it all began (on the 19th) so would the sperm before my period of clause me to fall pregnant?

Like I said please no nasty comments just a general question