thank you for your query.
Irregular and inter menstrual bleeding
occurs occasionally while on the birth control pill.
However, bleeding thrice in fifteen days is not normal.
Please consult your healthcare provider or a gynecologist for this issue.
If you had your period on 1st of march, your test wouldnt come up positive till you are overdue, so its too early to test for pregnancy
on the 14th.
too could contribute to irregular cycles and off and on bleeding.
A gynecological opinion is in order.