Late Period after Yuzpe Method? Advice needed!

Around 1.5 months ago my partner and I went raw. He pulled out (definitely came outside), and my calendar said I was not fertile that day.

​To be safe, I did the Yuzpe method (my first time) and took the pills within 12 hours.

​ ​A week later, I got a bleed that lasted 4-5 days. I figured this was the expected side effect/withdrawal bleed from the EC.

​My actual period was supposed to arrive last Friday. I'm now 3 days late!

​My worry: Did the withdrawal bleed mean the Yuzpe worked, or is it just a side effect that completely threw off my next cycle?