HELP!!!

The last time I had sex was on June 11th, it was protected and unprotected. I take the pill every day, never missed one.

On June 26th I took a test and it came negative.

On July 1st, I had my period (withdrawal bleeding) it lasted 4 days rather than 5 (heavy flow the first 3 days and light the last one)

But... I've been overthinking and I don't why I think I'm pregnant.

I've been having diarrhea and I just puke but it wasn't food, it was like acid

Do you think I'm pregnant?