I have had the implant about 4 weeks and never had a period since the day they put it in. I haven't had sex since but me and my boyfriend are considering it. My boyfriend has asked me when it happens if should he pull out (we do not plan to use condom) I said I wasn't sure maybe just to be safer but I also know theirs pre ejaculation during sex. I guess the way I look at it is their is still less sperm so less likely but my question is it even worth it to pull out?