Number of children. Do women change their minds after the first?

well I never wanted to have kids because as i was growing up i had to care for my 4 cousins and brother n sister and it was alot of hardwork for me!! But i got pregnant and i had my son 3 months ago Im 19 and yes im young but after having him i want more in the future not now though just later on... hes tons of fun to be with but times do get hard and i get tired but hey thats my consequences for having a child but i wouldnt trade him for nothing in the world! but i sure have cahnged my mind i want maybe 3 more :)