The big question would love to no what you reakon

NW

Does pregnancy occur at fertilisation or at implantation??

Been doing reading online and been finding mixed articles. I did IVF so the day of fertilisation means I am 6 weeks and 2 days but if I count first day of my last period it puts me at 8 weeks 2 days. what do you guys think???? Why do some Drs count ovulation as part of the weeks? As not a lot happens so confused. As they are saying I am two weeks behind.