 [ Symptoms ] what are the chances of becoming pregnant while using a contraceptive and no condom [ Disease ] they say the odds are like 0 1 personally i lack faith in that since my oldest niece and my youngest son were conceived on birth control without missing any pills but it is unlikely but a condom is still important birth control does not protect from stds so unless you know for a fact that your partner is free of all stds its always best to use a condom