having sex without getting pregnant


i want to have sex with my boyfriend but we are both teens that obviously don’t want to get pregnant. the only form of contraceptive that we can use are condoms, which we have, but i am still very scared of getting pregnant. is there a certain time of the month in relation to my period that i should have sex to lower the chances of getting pregnant? and also, do you think i should risk it and have sex(with condoms) even though some sperm might somehow go through? my boyfriend has negative thoughts on abortion and both of our parents will definitely be very very upset if we end up pregnant. any advice?