Hello Doctor.. Its My First Day Of Periods Today.. From

Hello doctor.. Its my first day of periods today.. From when should I be consuming t siphene 50mg to ovulate? And for how many days.. This tablet was given to me by my gynecologist last month from the 4th day.. But she said its late and I should be taking it from the first day.. But she is not available to answer my query.. Please help me out with this.. Or would you suggest anything else.. I am having too much of pressure from my in-laws.. I need a baby soon.. Please suggest me..