Birth control irregularity

Patient: Hello,I have been on my birth control (Necon 1/35) for two years. There was a holdup at the pharmacy, and I received it three days late. After I got it I just started it on the day it came in (so I never took the first three). A week and a half later (last Friday), I realized that I missed a days, so I took both days on the same night. Since then it’s been like I’ve been on my period (which is very light since I’ve been on birth control). Could my period date have changed? Am I still protected against pregnancy? Thank you.

Symptoms: Spotting, cramps