Baby fever.

How can I push this away! 
My son is a month old and I just have this intense urge to have another baby!!!! 
I planned on waiting a few years after my son was born so I could give him all my attention but now my boyfriend is tempting me to give in and have a baby as soon as I'm healed more. 
It would be so hard on me as my boyfriend works and I'm a SAHM. My son is hard enough but I attribute most of that to my PPD and his colic/reflux.