Safe to have sex?


I want to have sex on Friday and I usually am so like over protective with having sex because I get really nervous about pregnancy because all my sisters and cousins have had teen pregnancy so I am so traumatized... would it be safe to have sex on Friday? I heard it NOT safe to have to after you period ends and before your fertile week? I’m NOT on birth control and we always wear a condom I just like to take percussions.