I've been taking it for one month ever since Tuesday.
no, not if you have been taking your birth control as you should and for longer then just one month.... i also believe you were to close to your period for a pregnancy to develop. the period happens when an egg has not been fertilized.
if the birth control pill has not been taking regularly then take the morning after pill, which prevents a pregnancy...but must be taken 72 hours after intercourse.
good luck!!!
How long have you been on birth control? If less than a month, I'd strongly suggest going to Planned Parenthood or your local pharmacy for Plan B just in case since it's still possible to get pregnant while on your period. If it's over 72 hours since coitus, then, Plan B's supposedly not so effective, though.