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The obvious answer; having sex which caused a pregnancy. Plus many other life events: BCPs, stress, dieting, change in your exercise routine, illness, weight loss.

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Q: What can effect starting your period or not?
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Related questions

Can starting a antidepressant mess up your period cycle?

Nope anti-depressants shouldn't effect your period cycle.


Does humping a pillow effect your period?

No, humping a pillow doesn't effect your period. Your period is controlled by your menstrual cycles, masturbation has no effect on this what-so-ever.


Does having your period lower your pulse?

No, your period has no effect on your pulse.


Is gas a sign that your period is starting?

Yes, it can be If you are on your cycle and you start having gas, it a very common sign that you are starting a period


Can taking tramdol and gabapentin effect your periods?

No it shouldn't effect your period -


How does length effect the period of a pendulum?

A longer pendulum has a longer period.


If you quit smoking does it effect your period?

no


Do you have to of started your period to get pregnant?

No. There is a period of time before menstruation begins when sexual activity can stimulate the release of an egg (in effect, starting the menstrual cycle). If you are having sex, you should always use a condom, regardless of your age or stage of sexual development.


Do you defecate a lot when your starting your period?

You can.


Will starting birth control pills before period delay your period?

Starting the pill before your period may delay your period, but you may also have breakthrough bleeding during the first three cycles. If starting the pill before your period, use a back up Birth Control method for the first seven days.


Can herpes make your period late or not come?

No, herpes cannot make your period late. Menstruation is determined by your menstrual cycle, a cycle controlled by hormonal changes throughout your body between your brain and reproductive organs.


What does it mean when your period is pink?

means that you are starting your period or you are just really light