Doctor, Can You Please Explain The Process Of Getting Pregnancy.

doctor, can you please explain the process of getting pregnancy. what time is good for getting pregnant. After periods or before periods. I don't have idea. please tell me at what time. if you want periods date information. every month on 23 I get periods. It will finish on 4 or 5 day. please can you tell me. By the way my age is 23.