Now a days, medical scientists believe that in a normal couple, provided they have fairly frequent sexual relations, and provided they are not practising any contraception, the woman becomes pregnant within 6 months to 1 year. If it does not happen so, the couple should subject themselves for investigating for infertility. You have not mentioned your age. If you are elder than 30 years, you should not wait for more than 6 months. From your history that you have mentioned, it appears that your menstrual cycle is of 32 days. You had sex on days 16 and 19 prior to your next expected period. Day 16 before the MC seems to be OK for pregnancy. Now try to understand the simple calculations for becoming pregnant. Every woman produces the egg or ova only once in a menstrual cycle. This happens 14 days prior to the next expected menses. In a year she produces about 10 eggs and the two cycles may go waste, which two is very difficult to predict. So to become pregnant try to plan your sexual contacts on and around the day when the egg is released. Considering the lives of eggs and sperms, up to 4 days plus and minus the day of egg formation may prove to be useful. Considering this try to organize your marital relations. If with such practice also you do not become pregnant, better both of you get checked up from a gynaec doctor. Both of you should visit the gynaec simultaneously. Please remember that investigations for infertility take time. Before going to gynaec doctor, you can try one more way. Get your ovulation monitoring done from the sonographist to find whether you are forming the eggs or not, and if so when. Accordingly you can plan your intercourse.