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Irregular menses can be due to many causes, most commonly polycystic ovaries
and thyroid dysfunction
Visit a gynaecologist, do some tests like ultrasonography
of pelvis, thyroid function tests
, and whatever your dr advices.
Yes if the problem is not treated, pregnancy may not occur.
Eggs are not weak or strong. This may be a hormonal problem, which are treatable, and curable mostly.
For irrgular menses due to any hormonal problem ,you can take homeopathic treatment , safely.