How to avoid pregnancy naturally?

Don't have sex. If you don't have sex, then you can't get (her) pregnant naturally. If you want to have sex w/o pregnancy, wear a condom to minimize risk of sexually transmitted diseases. Or ask her to wear a diaphragm or sponge, either one w/spermacide. Copper iud & fallopian tube coils are two other non-hormonal methods. Whether you consider these methods "natural" is up to you. Timing is not very effective.

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How to avoid pregnancy naturally after 2 weeks of intercourse as I could see some symptoms of pregnancy.

Avoiding pregnancy. Avoiding pregnancy happens before intercourse with the appropriate form of protection or birth control. Unfortunately, if one does not prevent pregnancy, and becomes pregnant, then one must seek out an abortion. Read more...