Before 4 Years Ago I Got Married.now I Am 33years

Before 4 years ago i got married.now I am 33years & 4months old. we are trying for conceive.But still not.I take medicine & inj like Letrozol, pregnil inj.but there is no result. another problem ovarian cyst. But a big problem here. sometimes from day 16 of period do bleeding.not random.2/3 times daily.after 3/4 days its automatically cure. now my ques.what type of problem it is? why do such type of bleeding? pls answer.