Hi, i & my gf alwys had a protected sex by using condom,now we are planning to hv sex without a condom,we both knw that taking a contraceptive pill like unwanted 72 will b harmful for her in future, but we hav planned to consume it only once, just to hv sex without condom,m not gonna ejaculate inside her but will tell her to take unwanted 72 after unprotected sex,pls advice is it safe and will pregnacy b avoided.?