Hi! Im 14 y.o. . I got my period when I was 10 year old. And now Im 14 my period is still irregular.
The last time I got my period it is 2-3 months regular and now poof its irregular again about 4-5 months I don't know the exact months I delayed because its long.. Im 51 kilo ang 4'10 tall

You are still growing and changing so it's quite normal to be irregular at times. Ask your mom about it, as she probably has gone through this many times herself.