Negative test but pregnant ?

Has anyone had a negative test but pregnant ?? I’m usually regular every 30 days! But I’m now 4 days late on my period and took a test yesterday when I was 3 days late I took it in the afternoon and it was negative .. ALSO I know that they’re could be other reasons why my period hasn’t came I’m just asking if anyone has gotten negative test and ended up being pregnant 🥰 haven’t been stressing or anything so I’m really confused and I did have unprotected sex throughout my fertile week