Usage of Letoval,Metformin and ASA

Hi I am 29 years old. I had two miscarriages earlier. First one was in the third month due to bleeding inside. Second one was a blighted ovum. Now I am planning for pregnancy. My doctor in India told me to take Letoval tablet for 5 days starting from the day 3 of period. She also told me to take ASA tablet daily. I have PCOD problem so for that I am taking Glycomet 500mg twice daily. The first two pregnancies were natural without any medicines..Now Can you please let me know if usage of Letoval would be safe? And also ASA? If I become pregnant, should I continue Metformin and ASA? How safe is the usage of Letoval? Also, my doctor has not advised for any scans after the usage of Letoval. She said it is not required. Only if I miss my periods, she said I would have to take a scan to confirm pregnancy. I would like you to guide me regarding this.Also, I am taking Homeopathic medicines for the PCOD problem and I am glad to say that my periods have become regular now. Should I continue with Homeopathy if I become pregnant?