Late periods?

Question

I'm 17, sexually active (to get that out of the way)
In April is when I started to get periods late.. And its still happening.. Sometimes I'm 3 days late , sometimes I'm a week late.. I've had ovarian cyst before n ik that could be the reason but they popped in may , near the end.. I don't understand why I can never be on time .. Is something wrong with my body? Is this normal?

Answer

Your period could just be irregular but see your doctor because nobody but your doctor can actually give you almost accurate medical advice:)

Answer

Considering you've had ovarian cysts I'd see a doctor if I were you, if you hadn't I'd ignore it for a few months but just to be safe

Answer

If you want to get profound understanding of irregular cycles in teens – see the Fig. 3 and Fig. 6 in the research article (there is no need for university subscription, it’s easy to download pdf) -  Variation of human menstrual cycle through reproductive life (International Journal of Fertility. 1967, Vol.12, N1, pp.77-126). 
Shortly: it is normal to have irregular cycle up to 5 years after menarche. if you had menarche at 14 years – don’t worry, the reproductive system needs just time to work in god hormonal orchestra, but if you had menarche at 10 years – you have probably some problems with woman health, your reproductive health is lower than average, and it is better to listen to your body.
Regular - it is <average length> +/-2, 3 days, but not the span of 10 days of variation - it is a little irregular, the span of more than 20 days in variation (like from 20 to 40 days in cycle) - it is important irregularity.
Zero doctors could answer you simply – why it is irregular (too many factor of woman health is involved). Sometimes the diagnosis of one well-hidden disease could take many years. Sometimes one disease will never be diagnosed during all reproductive life of woman, because one woman is not able to listen well to her body or she is not interested in it.
If you want simple answer -> asks others, and not me     
If you will go to your doctor -> he will just scan all easily diagnosed problems, and he can find nothing and say - "it is ok to be irregular. You are just little irregular. Many woman live with this and don't worry about that"
Another point: the sexual live tend to regularize the menstrual cycle even if your man don't ejaculate  in you. 
When woman experience orgasme, when she has happy sexual life, her woman orchestra start to work better just because of sexual arousal and orgasme hormonal explosure.

Answer

I've had cysts and it makes my periods all types of whack

Late periods?

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