Can the emergency pill change your cycle? I'm on my 2nd period this month which isn't normal for me.

Unfortunately, this month I've been dealing with not one but two periods. This isn't normal for me. I took an emergency pill exactly a week ago because I had unprotected sex with my SO and he ejaculated in me for the first time . But about a week and a half ago I had just finished my period. I get my period once a month not twice a month and I'm worried the pill is gonna have serious effects on my body. I've taken that pill 2/3 times (because condoms have broken and I got scared I was gonna get pregnant) over the span of a year and this is the only time my period came early, extra early. Any suggestions on what I should do or why his happened?