Is It Safe To Take Duvadilan Retard During Pregnancy?

HI Doc, I am 34 yrs and this is my 2nd pregnancy, while I have a uterine fibroid and have concieved I have had severe pain in the lower abdomen in the 7th week of my pregnancy and hence i was hospitalised for epidural pain management, post which in the 12th week I started bleeding for which I was hospitalised and started with duphaston once a day, which was continued for a month, now I am 18th weeks and have been advised duvadilon retard 40mg twice a day along with folic acid and shelcal once a day.. pl advise if I should start the duvadilon retard for 15 days as prescribed