My Wife Had Miscarriage Earlier And Doctor Has Advised To

My wife had miscarriage earlier and doctor has advised to take alnagest 200Sr. she has been provided by the doctor who is pregnant 6weeks and she has been advised to keep it vaginally. she is taking it for the past 4 days and today while passing urine around 4 to 5 white color round shaped came out of vagina, is it ok that it comes out in this way and it is very hard to break it looks like somewhat soapy and it is slippery. on some days early morning pieces came out. wanted to know is it safe?