Broody again?!?! Just had baby.?

I'm broody again, i feel i want another baby right now, i want to experience pregnancy, go through labour and care for another baby. My son is only 9 weeks old and i love him to pieces and would not change him for the world but i feel as though i want another one. The thing is, there is no way on earth i could have another when my son is so small, i want him to have the time he needs with just me and his father before having more, i also don't think i could cope with another one so soon, we find it hard enough with one lol, so therefore me and my partner are definitely not having any for another couple of years, but i'm curious as to why i'm feeling like this? Is it just hormones?