Late period

Laurel • Full time momma of 2 princesses Nikaela 7 and Zaria 2.5
So
I had my babe about 12 weeks ago. Around week 7 is when I got my light 5 day period. (I'm EBF, never had a normal period but usually apps predict it right) well my question is should I be worried? I'm 3 days late. I do NOT need another baby right now.