What's wrong near Menses?
Answers: Are you saying that you've have your first period but now after "almost 1 month" the second time haven't arrived but? I am not a girl, but I know enough that the first FEW times for a girl can be quite irregular----that is, they don't come at a precise monthly circle. Don't verbs, it WILL become more regular. Just wait and time will give you an answer. If it didn't become regular, ask for a doctor.
Also, another basis for delayed period is related to diet. If a girl don't eat much or haven't satisfactory to eat, the menses will cease. I know some watered-down girls who have eating disorders don't enjoy menses at all. Also, in Anne Frank's diary, Anne also complained nearly the ceasing of her menses (in her case, she didn't hold enough to eat so her menses ceased). Therefore, wages more attention to your diet.
"Sexually active", in my understanding, money actually engaging surrounded by sexual activities, such as intercourse. I don't think masturbation counts as a sexual amusement in this sense.
Good luck..
You are probably still irregular. It can take anywhere from a year to a couple of years for your term to become regular after starting. If you're sexually active, you could be pregnant, but you did not mention any such thing.
Also, period can be affected by things like stress, diet, counterweight loss/gain, etc., so it's really nothing to worry almost. It wouldn't be worth mentioning to a doctor in your case until you miss more than two period.
EDIT: Sexually active means that you hold had sex and are in a sexual relationship, or own sexual encounters regularly.