If you are absolutely sure that this doe has not been with any other males and her kits are only two months old, the odds of her being pregnant are about the same as those of me winning the lottery - and I don't play. At 8-10 weeks, her offspring are old enough to be annoying, but not yet fertile.
If, in spite of that, you still think she might be pregnant, give her a handful of hay every day and watch to see what she does with it. Most rabbits will play with hay, but the only ones I have ever seen grab it up in big mouthfuls and pile it up in one corner were pregnant does. If you see her doing that, she at least thinks she is pregnant, and probably "due" within a week.