Hi my cat is pregnant, please help?

My cats last heat ended on 1 April and started exactly a week before hand. I do not know exactly when conception happened but from my workings out the earliest she could of had her kittens was last Saturday (25 th of may)I think and the latest will be next Saturday ( 9 June). However I wonder if there is anyone who could give me more of an estimate?

She began producing milk last wednesday 23 may since has become very affectIonate and needy. She has never really shown any certain nesting behaviour except for today where she got in the wardrobe and wouldn't budge. I put food and water there just incase. She then got out and went behind a box trying to putt the carpet up but I had to move her away from there as she can't have kittens on the floor boards ( I know how important it is not to disturb them but it just wasn't safe)

Now every time I see a new behaviour I do my research into it ( I have done ALOT of research, I have no social life haha ) but every time some thing happens such as the milk and the calling to me and the nesting, it always say 24 to 48 hours but obviously no sign of kittens yet.

I know that no one can tell me for certain I'm just very excited lol any ideas?

P.s her kittens are very active and seem fairly big rolling around her tummy