Thank you for your query.
It appears that you have an ovarian cyst
in the left ovary.
Without looking at the ultrasound report, it is difficult to say what is causing it.
It could be simple follicular cyst
However, since you are having a history of irregular cycles, it could also be an endometriotic cyst or a haemorrhagic cyst.
I need to have further details of the scan done.
Please consult an Infertility
You might need to have a diagnostic laparoscopy
to evaluate and / or treat the cyst, as well as assess patency of your fallopian tubes.
meanwhile, have your husbands semen analysis