Freaking out!!!

I had my baby April 13 of this year and had my first period on the 20th of May. It sucks but I wasn’t breastfeeding because my son wouldn’t take to it. My period is late and I’m freaking out. We used protection this time around so I thought we were safe. I had a c section and now I’m terrified of what it could mean for me if I’m pregnant again so soon after my first baby. Is it possible my period could just be erratic?!? I’m freaking out!!!