There are many causes of irregular periods
like stress, hormonal imbalance,thyroid disorders,sudden gain or loss of weight etc.
I would advice you to undergo certain tests like CBC with ESR, Thyroid function tests
and an ultrasound
Meet your doctor with the reports and if needed you can again take the treatment for regularizing your cycles, as this is needed before you plan your pregnancy
Don't worry,every thing would be fine.
Dr. Rishma Lakhani