Hi. First be sure that you are not already pregnant or any chance of threatened pregnancy
and only then think of taking Siphene
. It is contraindicated in first trimester of pregnancy.
You can start it in next cycle when no such doubt. To be started on day 2 of cycle, irrespective of no. of days of bleeding. you can check for ovulation by using ovulation strips at home or by getting Ovulation study from a sonologist.