 [ Symptoms ] what should i do if i suspect an overdose of p n [ Disease ] couples who use the pull out method for birth control often become parents this is not an effective contraceptive technique since viable sperm leaks out in semen before full ejaculation occurs you need to start using condoms 100 of the time or another form of birth control that is known to be more effective with that said yes you do need to do a pregnancy test if it is negative repeat it again in a week or so tests taken too early in a pregnancy may be falsely negative being late for four days is usually not a big deal but when you are not practicing an effective birth control method this could end up being a big deal