19 days late negative test ?!?!?

Mercedes
19 days late in my period and 2 days ago I took a at home test and it came out negative . I've been having cramps this whole week but nothing ? My breast feel fine but I do feel a lil nauseous in the morning sometimes so I'm so confused . My boyfriend is using my car for right now because his was stolen so I can't take myself to the doctors .. Idk what to think