... would it still be effective? or how long should i wait... Im 18 years old and have POS so is not unusual for me to skip some periods and not be regular... so i want to start having sex and i started the pill seven days ago (my period hasnt come since about a month and a half ago but im not sexually active so im not pregnant)..i was told that you can have unprotected sex after 7 days of starting the pill and be protected for pregnancy ... but i just want to be sure since i didnt started to take it with my period. Thanks!