Is It Safe To Take Ovuloc Despite Being Diagnosed With Endometriosis?

Hello doctor.I am Ruqaya aged 24.i am suffering from endometriosis for paSt 7 years and was on treatment to get pregnant through intra cytoplasmic sperm injection(ICSI) for past 4 years. I had undergone egg aspiration for icsi procedure but due to certain situations embryo transfer was not possible.the doctors had prescribed me regestrone tablet for getting my period for 5 consecutive days. Today its my 1St day of ma periods n Frm my 5th day I am prescribed ovuloc tablet for 21 days.wat my concern is dat in April dey have decided to do frozen embryo transfer(FET). Since I am looking for pregnancy is it considered safe for taking ovuloc tablet as it is used as a birth control pill???