28 Days
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There is no 'safe' period. Pregnancy can occur at any time during your menstrual cycle.
Irregular menstrual period means a period which is not a set number of days, it may be only a couple of days one cycle and then weeks the next. Irregular menstrual periods can also see irregular flow patterns so light then heavy one cycle, heavy all the way through the period of the next cycle.
Everyone is different - the average menstrual cycle length is 28 days but yours may be longer or shorter, it is also normal in your teens for cycles to be irregular.
The average menstrual cycle is 28 days. Five days for the menstrual phase (when a woman's endometrium is being expelled, also known as a period), nine days for the proliferative phase (when the endometrium is developing), zero days for ovulation (when a ripe ova, or egg cell, is deposited from an ovary), and fourteen days for the secretory phase (when the endometrium continues to develop.
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