Does Duphaston Treat Infertility?

I have a 4 year old son and my first pregnancy was natural. Iam 29 and TTC since, last 2 years agin.I had my follicular study done, this month my follicle ruptured today ie the 16th day after LMP. On day 14, follicle size was 1.8 X 1.4 . I want to know, for how long will the egg released after the rupture be alive? Also, now I have been prescibed tablet, Duphaston 10mg, for 10 days . Will this increase the chances of me getting pregnant?