Pill mishap or Pregnancy possibility?

I had unprotected sex just last week however the guy did NOT ejaculate. A few days later I missed 2 days of my birth control pills. Realizing this, I panicked and took 3 birth control pills in one day. Dumb, I know. Fast forward a couple days and now I have light vaginal spotting/bleeding and slight cramps. Is this likely due to the hormonal imbalance I subjected myself to due to the birth control mishap or to the unprotected sex that just happened a week ago?