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If you had your last period on June 28 th and used condom , you do not need any extra contraception
measure.You are in your safe period and there are very less chances of pregnancy
.Please donot take any medicines now.
You can adapt contraceptive
methods like IUD , monthly pills , Calender method , condoms to avoid pregnancy.Best way is to have any two of the above methods simultaneously to achieve 100 % efficiency.
If you need more information feel free to mail me.