As Neils Bohr showed, it is possible for electrons to move between energy levels. Light contains energy. If a photon of light strikes an atom, it is possible for the energy in the light ray to be transferred to one of the low energy electrons moving around the atomic center.
Spotting before a period is due â reasons for spotting before a period can be implantation, from a cyst or a short luteal phase and impaired egg quality. Spotting in between cycles â this is a difficult term to answer but often means your cycles are growing shorter; often with perimenopause.
The most common causes of spotting a week before period are irregular period and implantation bleeding. A normal menstrual cycle can last for about 28 days and a regular period may last for 4 to 7 days.If you have an irregular period, the menstrual cycle may be shorter or longer than 28 days.So menstrual bleeding or spotting may occur at different times each month. number of reasons can cause spotting a week before period. It can be caused by irregular period, implantation of egg, certain physiological changes or psychological conditions occurring in the body. Excessive stress, contraceptive pills or chronic diseases can also cause bleeding before periods.