period, sex, & being irregular?

[Stephaniieee =]]

so i heard this rumor that after your first time your period may be irregular.
has this ever happened to anyone?
it never happened to me but i'm really curious if it's true or not.

 

[Creux]

It becomes irregular if you get pregnant and miscarry. Other then that, it stays regular.

 

[Rawr]

no, i was still regular after my first time