Should Femisan Oil Be Continued Even During Menstruation?

Hello Doctor,
I used to have extremely painful periods for about three days and then lighter flow on 4th and 5th day, with no pain.
I have used a 1/2 inch ball of cotton dipped in Balaji Tambe's Femisan oil for nearly 8 hrs each night, on the 9th, 10th and 11th day of my menstrual cycle. I could not continue further use, but my period this time was very clean( no clots, clean blood, stain easily washable with water, and very little pain ), only that its been going on for 7 days now. the 7th day blood is much fainter than 1st day.
Qn is - how long should I keep this 'pichoo ( cotton ball dipped in oil)' in my vaginal cavity each night and for how many nights during the cycle?
Also, I am trying to get pregnant and we can get a confirmation of pregnancy only at the end of the month, when teh peridos are delayed. So is it advisable to conitnue use of the oil ball, even through the last few days of the menstrual cycle?