Ovulated late need some insight!

Jess

I thought I ovulated around the 1st or 2ns of Oct but I then got another blaring positive OPK on the 9th. Which leads me to believe I ovulated late. I didn't BD a lot because I thought I had already ovulated. Anybody know if a window of 4 days is too long to be able to conceive? Any insight is great, thanks!