Is it too late to take plan b?

I started my period around September 26th and it ended around the 30th. Someone came in me on the 2nd of October. I am on birth control but I got really sick and didn’t take it for a couple days. I’m not familiar with ovulation cycles but I have been trying to look it up. I am still really sick and wouldn’t be able to get plan b until tomorrow. Is it too late for it work and did I have sex around the time that would get me pregnant? I understand that this wasn’t smart. There were other factors involved that I’d rather not talk about and while I definitely do not want to be pregnant I know the consequences.