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can be caused by hormonal
imbalance as well as uterine problems.
Before getting pregnant it would be best if you visit your gynecologist for regularizing your periods. If follicles are seen which are releasing ovum it is a good indication.
In a regular 28- 30 day cycle the chances of pregnancy
are more during ovulation period which may be between day11-day14 after start of periods.but it is difficult to say in a irregular period.
Also you can take general precautions like avoiding stress
,having a balanced nutritious diet and mild exercise or Yoga.
Hope I could answer your query.