PLAN B OR NAH

I came off the pill almost a month now since the 1st of December, I was on it for 6 months straight. Took it consistently. I just had unprotected sex because my period ended two days ago, and he came inside of me thinking it’ll be fine since I stopped bleeding just two days ago but eve says that my fertile window is in two days. I’m panicking. How accurate is this because I now started tracking my cycle since I’m off the pill and so far I have not seen ovulation

I also have PCOS.