Is It Safe To Take Emergency Contraceptive Pill Frequently?

hi dr i had taken unwanted 72 in last month. after that yesterday was my 6 th day of period and i had unprotected sex with my bf.is it safe to take again unwanted 72 in this month as well.coz i had already taken 4 to 5 times this tablet earlier but not 2 tablets in same week plz guide me.is it safe?