Is it possible to have a negative 4 days after missed period and still be pregnant?

I’ve never been this late before.

On Tuesday, I had very light orange bleeding and thought it was my cycle. It wasn’t.

I had cramps until yesterday.

I had very sore breasts

Today they’re less sore and I don’t have any cramps.

I took the frer rapid response and got a negative. It was FMU.

Should I trust the negative result? Is it maybe too early?