Can you have twins if are not a twin?

No, it is not possible for someone who is not a twin to have twins. Identical twins occur when a single fertilized egg (zygote) splits into two separate embryos during the early stages of embryonic development. Fraternal twins occur when two separate eggs are fertilized by two different sperm cells. In both cases, the genetic makeup of the twins is determined by the combination of genes inherited from their parents. If someone is not a twin, it means that they did not develop as part of a multiple gestation and therefore cannot have twins.