Menstrual cycle

Bai
So ladies, after I had my son through c section, I've stopped having my period. He is  about 19 months now and I haven't been on my period still. I've heard that it's impossible to get pregnant if you don't have your monthly period, is that true? 
I've been told and research, it says that your hormones are unbalance. Ladies, have this happens to you? If so, what are ways you do to get your hormones back on healthy track?