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.
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Yes, your period may arrive early or late, and you may have spotting until your period comes. In addition, the period after that may also be delayed.
If you get your period, you are not pregnant.
The time that cramps start vary with everyone. Some get them days before their period while others get them the day of their period.
Period is how long it takes for the sine and cosine functions to restart repeating themselves. Both have a period of 2pi (360 degrees).
masturbation helps relieve period pain but only while you are on your periods