First off, home tests are not 100% accurate. So to confirm pregnancy it is best to have a blood test to determine this. Now with that said, some times a woman just won't ovulate for a month (which is normal) if one doesn't ovulate, no period. It could be hormonal as well, which could be the start of per-menopause. Other factors that can cause this include: stress, weight gain/loss, medication, illness, climate, cyst, or polyp of the cervix, hormonal, thyroid, infection.. just to name a few.
Without a proper exam it would be hard to pin point the exact cause. But do call your doctor and start with an accurate test to confirm.
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