thanks for your query.
You need to post the entire follicular monitoring series of reports, as it is impossible to tell you the prognosis based on the single report provided.
Normally, if your cycles are regular, a follicle matures by day 14, when it should be 20 - 22 mm in size.
The size you mention for day 13, is definitely small, and indicates anovulation
, unless you have delayed cycles and had late ovulation.
Also, for checking the pregnancy
, please follow up with the gynecologist who is treating you, as he/she would have best access to your complete history, treatment response and can confirm a pregnancy best.