Should I take a Plan B?

I’m already on birth control, and I take it fairly regularly - at the same time everyday, usually within fifteen minutes of a certain time. Sometimes I’ll take it a couple of hours early if I have to work.

I had the condom break yesterday, and normally it’s not a huge deal because I take my birth control correctly. However, I have been taking melatonin to help me sleep recently because I’ve had a cold, and I read the melatonin can mess with the effectiveness of birth control pills?

Should I take a Plan B, or was the article just wrong?