After taking Plan B and getting your period about one week late, should you expect your cycle and next period to be on time and go back to normal?

I’m asking this question because after taking Plan B and getting my period one week late, my ex boyfriend sexually assaulted me on the second day of my period. He pulled out without a condom, I didn’t want sex at all. I wonder how Plan B could affect ovulation in my next cycle. My period was six days long (as normal), followed by two days of old brown blood cleaning out. My cycles are usually 32 days long, but I’ve read how Plan B messed up a lot of women’s future cycles and made them shorter and I can’t help being scared. Any advice? Thanks.