Lee Radziwill rushed to get married at 20 because her sister Jacqueline Bouvier was 24 and engaged. Lee beat her to it, but was divorced in less than a year.

So basically, OP, you and your sister were both fortunate enough to find a spouse, have a wedding with the whole family, and get pregnant. Your kids will be able to play together at family events. Your parents became grandparents twice over.

So sorry. That sucks for you. My prayers will be with you in this trying time.