In early pregnancy its not easy to feel anything, so it doenst mean this vet was unskilled. And the nipples dont always pink up in the classical strawberry color. Now two weeks later it is probably easier to feel if there is something inside or not...
Still, IF you are considering a possible spay /abort, it is entirely possible, as Tulosai says. It doesnt seems to be that late to be ethically or medically touchy.
If you want to proceed with the pregnancy, I will send you some links at latest tomorrow, when Im sitting at another computer.
We have a good collection of articles in the Cat Health section which you can access by scrolling up to the brown bar, clicking on Articles,and then choosing the Cat Health section and scrolling through the choices. To make this super easy for you, I am copying the links regarding birth, delivery and newborns for you here. After reading this information, let us know if you have any more questions. And good luck with your approaching new arrivals.