Hye Doctor I Am 29 Years And Married From Last

hye doctor i am 29 years and married from last 2 month me and my husband do sex without using any precaution.he always ejaculate outside.i dont want to get pragnent so early of my marriage not atleast for one year so please suggest me best method for avoiding pragnency are usinng of birth control pills harmful my friends strictly told me not to take contraceptive pills.so please sujest me best wayout.and please also tell me what are the safe days after periods for doing sexin which yoy have least possibility of being pragnenet this month my periods came on 7 th.