stomach flu and birth control

an

So on Friday April 20th I had condomless sex and on Monday April 23rd I caught the stomach flu. I take my pill at 8am and at 6:30pm I started having severe diarrhea. I’m talking 15+ trips to the bathroom. I also vomited 3 times.

So here are my two questions:

1) Was the sex I had on the 20th still protected?

2) Do I need to use backup for the 8 days after I got the stomach flu?