Thanks for the query.
Sometimes while using contraceptive
pills, side effects like amenorrhea
If you used all the active and inactive contraceptive pills as per the schedule, the possibility of pregnancy is less.
But sometimes antibiotics, recent illness etc can alter the effectiveness of the pills.
Biaxinxl containing clarithromycin
may sometimes alter the efficacy of pills but there are no proved evidence.
So you once go for blood test
If the test comes negative, the possibility of pregnancy is very less.
And you can continue with your new pill pack.