thanks for your query
The mainstay of therapy for PCOS
is weight loss
and lifestyle management.
Please aim at an ideal BMI.
Within the first month of taking OC pills, you should always use a backup method, because within the first month, the pills are not that effective.
Hence, chances of pregnancy
are definitely there.
However, with your severe PCOS, i think your periods are delayed due to PCOS.
Please consult your gynecologist before taking any further pills.