thanks for your query.
is the term wherein the mature follicle fails to rupture.
If the rupture started on the 15th day, by day 17, it should have ruptured.
If it does not rupture in a day more, then it is called as anovulation or LUF ( luteinized unruptured follicle ).
There is no process to follow after this.
This cycle would be cancelled, and chances of conception are nil.
The unruptured follicle could regress on its own, or form a small harmless cyst, called a follicular cyst
, which would disappear on its own or with medication in the next cycle.
Also, remember that you need to be investigated thoroughly for causes of anovulation.