Hi,
There are numerous reasons why your menstruation cycle can run late, Pregnancy and stress being the most common.
If you have been sexually active you should take another Home Pregnancy Test to determine if Pregnancy is the cause. Make sure you do it first thing in the morning as the Pregnancy Hormone is at it's highest at this time.
Should you get a positive result you will need to speak with your doctor about beginning prenatal care.
If you get a negative result, make sure you repeat the test in two weeks to make sure. You also should consider whether or not you've recently been sick, gained or lost a significant amount of weight, have been under excessive stress or have taken any new medications. All of these things can affect your menstrual cycle and cause you to have irregular periods. Since you are breast feeding this may be the cause of your delayed cycle. Often your menstrual cycle can become sporadic while breastfeeding ass a new baby and all the little worries and stress a new mother has and you can see the reasoning behind a late or missed cycle.
I would bring it up at your next doctors appointment, if you continue to miss cycles it is a good idea to set up an appointment with your doctor to determine the cause and begin any needed treatments.
Walter
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