How Did This Happen?

Tykeah
 A friend of mind were invole in two pass realtionships. One for 3 years and another one for 2 years! Never been pregnant by neither one of them! However, the realtionships she been in for 2 years which is now her X! He is expecting a child  with someone. As of today she is in a relationship 25 years old never been pregnant! All of sudden within this realtionships she is expected! 😱😱 How is this possible for her!