Marriage?

In high school I always said I didn't want to get married, I didn't want kids then I met my son's father and well I had my son but he wanted more kids even proposed and we were together almost five years. 3 years later call it fate, destiny, the universe bringing me to my now boyfriend after three months we broke up and I also realized I was late but at the most for me my normal was a week late so initially I didn't worry til it was two weeks we eventually starting seeing each other as friends and eventually got back together. We both agreed neither one of us wanted to get married because who needs a piece of paper to tell you your going to be with someone forever. Now yes everything happened so fast and none of it was what we expected, it was literally a whirlwind romance. So now out of the blue I started to feel sad that I would never marry him not even a year from now or two even though we have a baby on the way. Am I crazy for all of a sudden thinking I want to marry this guy, are my hormones making me irrational? Maybe but right now I'm full of happiness and love for the family we are about to start and that soon it will be a family of four. I feel crazy lol