Effectiveness begins to decrease 12 hours after sex, but efficacy is still good for a while afterwards.
Emergency contraception like this works by preventing or disrupting ovulation (IIRC, it's been a while since I looked at this stuff). It doesn't function as an abortifacent, so if fertilization/implantation occurs, it won't really do anything. That's why it's better to get it ASAP.
Well what if a woman is pregnant, can she have an 'abortion' after like, a week after missing the period? Or do you actually have to wait till something develops.
There isn't much info on this on the net for some reason.
I know there are abortifacients specifically designed for use within one or two months of conception, but beyond that you'd probably be best off going into a PP clinic or something. I don't know how the actual process of getting it would work.
It'd be unpleasant and painful for the girl, mind, and she'd have some pretty nasty side-effects. It's not anything but a last resort.
Plan B works up to 5 days, but within 3 days is best. It only works as long as the implantation hasn't occurred, if it has Plan B doesn't actually work.
There are a couple alternatives when considering abortions. Two common methods is to go to the doctors for surgical procedure or take pills. The only downside to taking the pills is that the side effects are often painful.
I wouldn't worry too much. There's been a lot of times I thought I was at the risk of pregnancy and turned out I was okay. In then end it takes a lot for a pregnancy to occur. And if the girl's period is delayed it can also be due to the amount of stress she is having. I was incredibly stressed out recently and my period came a week and a half late. Also girls often think they are showing the symptoms of pregnancy, but sadly, much of the symptoms for periods are the same and its hard to distinguish one from the other (unless she is puking her guts out.) They both cause sore breasts, stomach pains, dizziness, and fatigue.