Hi Doctor (s) I m currently on my second year with Nexplanon, I don t usually use recreational Marijuana but I smoked a tiny bit on Wednesday of last week. It s been a little over 10 days since I ve smoked (9/10/16 today) I did get full effects of it. My bf and I had sex afterwards and he didn t use a condom because he was all out of them. My questions is, Does marijuana affect the contraceptive? My bf usually uses a condom but this is the only time we didn t use one! Also, I don t have a regular menstrual cycle, there will be months where I don t get a period at all. This has been going on even before I started using this birth control, so I can t really know if I m pregnant or not. I ve only been having nausea, I feel like it could be the greasy food I ate these past few days. Any advice will help!