Unprotected Sex while on Period

I have a little concern that I need some advice on.

So my partner and I had sex last night, and it was unprotected. However, I am on the pill. I’ve been consistent, and I haven’t missed a day of my birth control pills.

When my partner and I did that, I was on the placebo pills for that week. I’ve googled and it’s said that it should be okay. But I’m not sure if I should take a plan b just in case or if I shouldn’t even have to worry about this?