Hi,
Thanks for the query.
Delay in periods can occur due to many causes, like:
-
Hormonal imbalance due to causes like poly cystic ovary disease, stress and strain, weight changes etc.
- General conditions like
thyroid hormonal abnormalities,
anemia etc.
-
Pregnancy.
Urine pregnancy test kit may not detect early pregnancy sometimes.
But as you tested one week after the missed period, the result may be accurate.
To get confirmative result, go for
blood test for pregnancy.
This will give accurate result compared with urine test.
For more details :http://srsree.blogspot.in/2012/05/pregnancy-tests.html
Usually prenatals won't affect the menstrual cycle.
So, after blood test consult gynecologist once and take tablets to induce withdrawal bleeding.
Take care.