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The best contraceptive
differs from person to person as it depends on tolerance of the body.The common methods available other than condom are copper-T;OC pills;vaginal tablets
like TODAY which is a vaginal pessary and it dissolves and acts as a barrier for the sperms preventing pregnancy;vaginal ring(Nuvaring
).As with all the failure of contraception
is always associated in a very small percent of females.
The best contraceptive it it is tolerated will be copper-T which fits
your bill with all the criteria you want like it will not increase weight;the failure rate as compared to Today or vaginal ring is less;and you can conceive easily after removal.