Thanks for your question on Healthcare Magic.
I can understand your concern.
Honestly speaking, chances of
pregnancy are very less.
PCOS (poly cystic ovary syndrome) causes
infertility. So pregnancy is unlikely in her case.
Her menstrual irregularities are mostly due to
hormonal imbalance.
PCOS causes hormonal imbalance. This causes menstrual irregularities and infertility both.
So better to consult gynecologist and get done hormone levels to regulate her hormones.
Once her hormones are normalize, she will have normal menstrual cycle.
At present, no need to worry for pregnancy.
Hope I have solved your query. I will be happy to help you further. Wishing good health to your girlfriend. Thanks.