Just as a side note...A lot of birth control does not necessarily prevent conception. The birth control pill, patch, IUDs, etc. can all allow conception to take place and the uterus to not be a friendly environment. If you are using 'pregnancy' as a baby already having attached itself to the uterus, then you could say it doesn't end a pregnancy. However, there is definitely the possibility that it will end a life.
My point with the morning after pill is that it does not necessarily keep the egg from being fertilized (conception). If the egg was there and the sperm got to it before taking the pill, then it is very possible for conception to occur and thus a baby to be created. What would happen is that when the baby arrived in the uterus to attach to the lining, it would not be able to because the pill would have irritated the lining preventing this. Thus, the baby has still been created but now has no where to go except to be expelled.
The morning after pill (or plan B) does not cause an abortion, it can prevent ovulation if taken before ovulation has occurred. check out any of the links below to read it yourself but here is a short excerpt -
Unlike RU-486, the Plan B pill does not terminate pregnancies, but rather, prevents them from occurring. Progestin-based pills like Plan B work by disrupting a woman's normal hormone cycle. If taken prior to ovulation, it works by keeping the ovary from releasing an egg. The Plan B pill may also help prevent pregnancy by keeping the sperm from fertilizing the egg and preventing a fertilized egg from attaching to the wall of the uterus. If the fertilized egg is already attached, the Plan B pill will not harm it.
Read more: How Does the Plan B Pill Work? | eHow.com http://www.ehow.com/how-does_4570593_plan-b-pill-work.html#ixzz10KkAjIa6
http://www.ehow.com/how-does_4570593_plan-b-pill-work.html
http://www.netdoctor.co.uk/sex_relationships/facts/morningafterpill.htm
http://www.mayoclinic.com/health/morning-after-pill/MY01190
Could go either way. This could be implantation bleeding. If you have the typical 28-30 day cycle, then based on your LMP, you would likely have ovulated about the 16th or 17th. Sperm can live in your body for up to about five days. Thus, if you had sex on the 15th, there would likely be sperm waiting in there that would fertilized the egg when it was released.
The morning after pill doesn't keep the egg from getting fertilized. What it basically does is irritate the lining of the uterus so that a baby that has already been conceived is not able to implant. Thus, it causes a very early miscarriage/abortion.
The brown discharge could be the baby implanting or could be due to the baby being expelled due to the lining of the uterus being irritated. If conception had not taken place, then it could be just due to the lining being irritated.
You need to do a pregnancy test if you miss your regular period.