it always seems that girls "forget" pills when they have sex for some reason.
birth controls not 100% thats why you should ALWAYS use condoms in addition and when you miss pills the effectiveness does go down. you just have to wait. its a waiting game now
I wouldn't worry about until you don't get your period for the next cycle. I myself have been on the "pill" and ended up with three kids later due to the same reason forgetting and then trying to double the next day to make up for it. If your very active person and some time forgetful i wouldn't recommend the pill, you'll end up getting pregnant when you at least expected trust me. There is a "modern" IUD that is inserted into your cervix i believe that lasts for about 5 years. you don't have to worry about taking something every day or every month. there's always a down fall to everything, but if i were you i would check into that,it wouldn't hurt to know more and better options. GOOD LUCK!