<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi! I had sex with my parter, we used a condom but it broke. I have the nexplanon implant, and had it for about 3 weeks at the time of sex. I missed my period, but my period has been really irregular due to the insert. Today I got a gooey brown discharge, and my period is 6 days late. Should I be worried about pregnancy?  <response>: Hello thanks for using Chat Doctor Explain is one of the most effective contraceptive methods with failure rates of only 0.05. Haven been on the explain for three weeks at the time of the unprotected sexual intercourse, it is less likely that you could have fallen pregnant. Nexplanon is a progesterone contraceptive with side effects such as irregular bleeding, irregular bleeding, absent menses etc. You could take a pregnancy test with early morning urine to be re-assured there is no pregnancy. Best regards Chat Doctor. 