Pay sales tax with the Retail Sales Tax Return For Occasional Sales (DR 0100A) on the tangible personal property included in the purchase of the business by the 20th day of the month following the sale.
So, to avoid pregnancy she has to better avoid unprotected sexual intercourse in this period. The rest of the days i.e., starting from menstruation to the 10th day and again from 21st day up to menstruation are the safe days or the safe period to avoid pregnancy.
Identification. Menstrual flow is different for each woman, but usually occurs between day 28 and day 34 of the monthly menstrual cycle. On average, menstrual flow lasts about 4 days. A period that lasts longer than 7 days, in considered a prolonged period.