pullout method on bc

i’ve switched from NuvaRing to Balziva to a mini pill (Mylan) in the past couple months and this is my first month on the mini pill. my SO and i have sex without a condom and he always pulls out. I’m 5 days until aunt flow and have barely any PMS symptoms. Light cramping, tiredness and major irritability but no breast pain which is uncommon for me. Is this because of the Birth Control? Could I be pregnant?