Infertility advice needed

Patient: Although I’m not trying to conceive just yet, I’ve recently been diagnosed and treated for Chlamydia and I believe I had this for a year, I’m now a little concerned that I won’t be able to conceive in the future. My period are very irregular recently for example I can have multiple per month but this could be down to me changing my pill. I just needed advice on the whole infertile situation. How do doctors test this?

Symptoms: Infertility, chlamydia, irregular periods