The condom broke and I just started birth control pills 10 days ago. What should I do?

My last period was January 18th, and then I started the pills two days later (the 20th). This morning, the condom broke.

I have been reading different things: Some people say the pills are effective within 7 days, others say a full month. My gynecologist had said a month. I called her office, but since it’s sunday they’re closed. I was thinking about getting plan B, is that necessary? Any advice would be greatly appreciated!