Plan B Period Effects

I’ve taken plan B in the past a few times but haven’t in years! So this is my current cycle…never have I had 2 periods in a month and I know that’s a side effect, but for my next period am I going off the second period timing? The March 10-15 dates? Which will make my period be around this weekend…April 5/6? I just don’t want to be caught off guard in public! 😅

Glow predicted a period to start the 30 but I think it was going off the first period maybe? I don’t know 🤣

Help.