Progesterone and period

Hey ladies. I had an early miscarriage in april and the doc found out i have low progesteron. As i live in UK I didn't get any treatment and i was sent number of times for the same blood test every month. July i went to my country and had a proper gynaecological check and been prescribed Utrogestan. Since that time my period is a bit funny. I had period 1st of August, 25 of August and how 8th of September... I dont know what to do as I suppose to start my utrogestan on yhe 16th day from day 1 of af. But now i have period 14 days after the last one haha... has anyone been taken utrogestan? Any similar stories? 😘