Thanks for the query.
I understand your concern.
Usually nexplanon can give protection from pregnancy if used as per recommend guidelines.
But sometimes drug interactions can affect the efficacy contraceptive method as you told.
Though some of your symptoms are suggesting pregnancy, just by symptoms we cannot come to one conclusion.
And also irregularities in menstrual cycles can occur due to many causes.
Better to go for blood test for pregnancy once, which can give more accurate result compared with urine test.
If blood test also gives negative result, there is less possibility of pregnancy.
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