The general solutions for the harmonic oscillator differential equation fall into four general categories: 1) Undamped: [math]x(t) = Ae^{i\omega t}[/math] This is a free-running sinusoidal oscillation that doesn't change over time.
Key Facts. 1  Itâs normal to have mild cramps during your period. 2  Menstrual cramps often start 1-2 days after your period begins. 3  If your cramps donât get better with over-the-counter medicine, you should see your health care provider.
How can you tell the difference between PMS symptoms and pregnancy symptoms you've been having cramps and one of your breast hurt for a day but it is time for your period in 1 or two days? Answer There is no sure way to tell except to wait for your period and if it does not come take a pregnancy test.