Late period

Stephanie • I`m 18 years old. I have a 10 month old son, Gabriel Mateo 💕 Expecting my daughter 4/4/17 ❤
My son is 3 months old. I bled for awhile after having him but I recovered quick. I had a period for 5 days. My periods aren't normal. I use to only have them twice a year. With no birth control that's just how they were. I haven't had a period this month. I don't feel pregnant but should I freak out or wait?