so I was supposed to start my period 2 days ago and I haven't started yet. I had my son in December…

so I was supposed to start my period 2 days ago and I haven't started yet. I had my son in December and have had 2 or 3 periods since then about 3 weeks apart. could my body be adjusting still and could I start having 1 period a month instead of 2 or could I be pregnant??. 😳😳😳