Yeah the best way to know is to see a fertility doctor:) its pretty expensive though.
Yes. But trying to have twins are hard. If it doesn't run in the family then you have a 1 percent chance. African Americans have a 2% chance because of something I can't remember. But it is hard either way. If twins run in the family then you have a 3% chance. Still very low
Yes. Identical twins are not genetic only fraternal are genetic.