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.
Your periods may be irregular when you first come off the pill, and you should allow up to three months for your natural menstrual cycle to re-establish itself fully. This is because the pill contains the hormones that stop ovulation (the release of an egg) each month.