Expired birth control.. f**k..

Soo.. long story short.. I had a pack of pills from January, Seasonale so the 3 month pack. I started taking them again in August (I was diagnosed with anemia so wanted less periods to try to help that). I hadn’t been sexually active until this past weekend. Went to take a pill today and noticed the expiration date was 6 months ago!!!!!!!

Has anyone ever accidentally taken expired pills and not gotten pregnant? I had zero breakthrough bleeding, no fertile CM.. it’s too late for Plan B. We did not use condoms. (Close male friend, STI free)

What are my chances? Lol I do not want a pregnancy right now.