3months pp

Hey ! I’m almost 3 months PP. I had my first period last month and it was 4 days long and pretty much like how my periods were prior to baby. However now I’m 3 days late and spitting brown off and on. Have had sex with protection twice but I’m so damn paranoid, and I’m waiting for my birth control pills in the mail lol . Could it be body just adjusting still? So fkn scared 😭😭😭