Yes because the twins don't have to come out at the same time. Its if they are ready to come or not. One might be taking all the things they need inside you and the other one will have nothing so it wont be formed the way it should xxx
Is It Possible Two Have Two Separately Conceived Pregnancies At Once?
Yes apparently. My friend was carrying twins and the doctor told her they were a week apart. Its a crazy world.
Yes, you can have twins conceived separately within the same menstrual cycle. This is called superfecundation. There is an overview of different types of twin here.