Many woman who have normal periods are infertile - could be blocked tubes, anovulatory cycles ( no egg ), endometriosis, turners syndrome, all sorts of things. Some are hereditary - but far from all - and many are overcome-able with assisted conception - sometimes drug therapy, sometimes IVF.
You need to get a full assessment if you are trying to conceive and having problems - both you and your partner will need to be checked out.
Good luck - I was told I'd need donor eggs and would not have a child of my own, only to find out a week later I was pregnant.
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