Does anyone have insight on what will happen when I take Plan B while on the Slynd mini-pill?

Slynd has currently stopped my period entirely. Unfortunately, I forgot a pill yesterday and then had sex this morning. I’m planning to take Plan B, but I have taken it once before when I was not on any BC, and it made my period come early and heavy.

Any idea if it will cause breakthrough bleeding or anything? If I haven’t had a period in months, have I stopped ovulating and am likely not at pregnancy risk even though I missed a pill?

Thank you!