ANSWER: Monthly period must not exceed in TOTAL 15 days per month. Therefore, if you got it for 15 days then after 11 days, you got it again, this is not your menses and it is istihadah and must wash the blood and perform wudhu for every prayers after the athan is called. 

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ANSWER: What they say is absolutely baseless and fabricated.  No problem at all in cutting your nails or hair during menses. 

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