Twins have to run in the mother's family (women biologically related to you) in order for you to be more likely for it to happen. It's not impossible, but it's not likely you will have twins because they are in the father's family. My uncle has twins but because the mother is not blood related to me, twins don't exactly run in "my" family.
No it's called being bloated. I'm sure you'll find out soon enough if you are carrying twins. Best wishes