Well Ive had nexplanon for almost 2 years now.. About a month or so ago I had a UTI and kidney infection so I took amoxicillin. I didnt know that that could have any thing to do with the effectiveness of my birth control amd had unprotected sex with my boyfriend. About 2 weeks ago I had a really think whitish discharge followed by about 2 days of very light spotting that was pinkish in color. I had a lot of abdominal cramping for a few days and tiredness. Also Ive been moody and sick to my stomach all the time. I didnt really think much of it until a few days ago when my nipples got super sensative all of a sudden and my boobs feel noticably fuller. Then out of curiosity i squeezed my nipple and a milky fluid came out. Then finally today I noticed little bumps on my areola just like I had gotten before. I know the chances of getting pregnant on the implant are slim to none... I just dont know of the antibiotice really did mess it up.