withdrawal bleeding??!?

i’m about 80% sure i’m pregnant, but no I haven’t taken a test yet. Had sex during my last period w no condom only pull out and a week before ovulation with pull out method. I have all the symptoms and I can feel somethings not right. Im also on the pill but take it at various different times ( not consistent) and was 5 days late to get my period on the break week. I did get a little spotting yesterday but I heard someone say withdrawal bleeding is a thing???!!! does anyone know anything about that while on the pill!!