Different days for.....

Just a quick question for all you ladies, on some ticker sites like babygaga, it says I'm 5 weeks and 4 days and (this is if I go by my last period) and on others like my current ticker it says I'm only 5 weeks and 2 days. ;)

Does anyone no what the go with that is? ;) Bit confusing I gor my last period on the 26th (start) of Feb and doesn't that mean Im due 3 Dec?

So by these dates Im 5 weeks and ? or am I stuffing the whole thing up.

Can someone hep me plse? :shock:
Thanks O:)

I think mainly it has to do with where the site originates & if you put the right time zone in for you. Some sites just ask for country of origin others ask for your precise time zone. Also if the site is in America they change their dates during our nights. HTH!