avoid having sex without protection...
Virus protection
abstainance.
Same as always antibiotics don't avoid or help the risks of getting pregnant.
The best way to avoid pregnancy without contraceptives is abstinence. No other method will be 100% effective. Without contraceptives you are going to have a pretty high chance of getting pregnant, even with the 'rhythm method.'
OMG... *Facepalm*
To use protection when you have sex. Wear condoms.
If the sperm comes in contact with her vagina, yes. It is quite unlikely that this would cause pregnancy but it is possible. To avoid pregnancy, it is best to avoid sperm coming in contact with the vagina without protection or contraception.
Birth control pills Don't have sex Diaphragm
There are no such days- you should always use protection to avoid pregnancy, even during your period.
The traditional way of getting pregnant is by having intercourse - so the best way to avoid this is by refraining from any sexual relations. It is the only 100% guaranteed way to prevent pregnancy.
Yes, it is very possible for a girl to get pregnant while on their monthly period. Always use protection to avoid an unwanted pregnancy.