Is it a theory or a certainty that birth control pills can stop a fertilized egg from entering the uterus?

I found this on TONS of sites! >>>> " The hormones in the Pill can also sometimes affect the lining of the uterus, making it difficult for a fertiziled egg to attach to the wall of the uterus."
Answers:

Bumps right outside vaginal gap?

Well what u r talking going on for here is called "post-coital" contraception..... to be exact certain drugs when taken can stop u from getting pregnant even if u takem 48 hours after sexual intercourse.

This kinda medication is in actuality available over the counter ... and they come in packages. simply they contain ur regular oestrogen and pregesterone pills in a very dignified concentration

These are not to be practiced routinely since they do have a bomb rate and they can cause side effects similar to migraine , dysmennorhea ... and stuff like that .... so they are usually as far as i know taken by ... post rape women , infantile teens who have a doc line , and occasionaly a smart women who forgets to take the pill

Do distress killers have any effect on menstruation,,like stopping the bleeding for a while?

If I remember correctly, birth control pills do not prevent eggs from entering the uterus. They can't become fertilized (usually) unless they do. The total idea of hormonal treatment is to stop the fertilized egg (or any egg) from attaching itself to the uterus.
A fertilized egg is not like thing as an embryo. It take a good 24 hours, at lowest, for a fertilized egg to develop into an embryo (which is when all the gene mixes). This is why the Catholic Church's opposition to birth control pills is so stupid.

SWIMMING WITH PERIOD! Help!?

This is true. There are two different types of pills. One have two hormones the other only one. They both do one and the same thing commonly but one, the one with both hormones, make it less possible for a fertilized egg to bring implanted. This means that in that is a possibility that one may get pregnant while on birth control and the fertilized egg will be abort by the body since they will be unable to hold it.

Do prenatal vitamins really increase bust size?

Estrogen and progesterone. These hormones are synthetic version of naturally occurring womanly hormones. They work primarily by preventing ovulation.

Watch out for the side effects, they are drastic.
Blood clots
Abdominal pain
Chest pain (also shortness of breath)
Headaches (especially those that are new, severe, or associated beside persistent dizziness, difficulty speaking, faint,numbness or weakness contained by extremities
Eye problems (blurred vision or loss of vision)
Severe leg discomfort (and/or redness and swelling in the calf or thigh)
High blood pressure
Liver tumors
Breast cancer risk
Cervical cancer risk
Nausea
Spotting or breakthrough bleeding
Breast discomfort
Mood changes
Decreased sex drive
Weight gain
Gallbladder disease
Cervical change
Vaginal discharge

How do I ta k to my mother about have a enlarged labia and going to the doctor for it?

The pill tells your body that it is pregnant...thus you do not ovulate. Maybe you are confusing the pill with the "Morning After" pill?