Are Mybulen Pills Advisable For Menstrual Pains In A Nursing Mother?

Hi,my name is Roelien, I m 22 years of age and usually get extremely painful period pains. I recently gave birth to a baby boy( now 2 months and 8 days). I would just like to know if it is safe to use Mybulen pills for my period pains, whilst I m still breastfeeding. I used it before I got pregnant.Thanx