oral progesterone when breastfeeding? 

Hello Im 5 weeks 4 days along and my progesterone levels are 11.  I've also had many miscarriages. My docter prescribed me oral progesterone 200mg once a day, but it concerns me since Im still breastfeeding my 18 month old. I read online that vaginal progesterone was usually what is given and is safer for use when breastfeeding. Have any of you taken oral progesterone when breastfeeding?