Is this normal?

So I’m 13 and I’ve had my period since I was 10 therefore I’m not that new to having a period and stuff. There is just one question I have. Is it normal to have bad cramps before your period? I have an irregular period so it’s hard to tell when its coming but I get bad cramps just before it comes. Idk what to do because it happens throughout and a little bit after. Plz help!