Hello
Thanks for writing to us with your health concern.
You have mentioned that she is on the Implanon.
It is perfectly alright to have unprotected sex while on Implanon.
The possibility of a pregnancy is next to nil.
Please, you do not have any real reason to get worried.
Menstrual irregularity is also common while on Implanon.
You can take a pregnancy test to reassure yourself, but I find it unnecessary.
Implanon is meant to allow you to have unprotected sex, after all !
All the best.
Please feel free to discuss further.