i went on holiday recently but was unsure when i was due on an on advice from a family planning clinic got my doctor to perscribe some tablets that u take for 3 days before your due on and then until you dont need them anymore.. you keep taking them three times a day.
sadly i cant remeber the name but its a long word beginning with N... your doctor will know .
If you are on the pill, I think you can take the next pack without a break to stop the bleeding. Read the bumph in the pack, it might say or ask your pharmacist for info.