Maybe pregnant? Opinions please!

My period is 4 days late now which NEVER happens to me. My boobs are super sore & sensitive. I took a test 2 days ago & got a negative. But i took it in the afternoon after drinking water and sprites all day so that could’ve affected it? Anyways this is weird to me so does anyone think I could possibly be pregnant? Or what are other factors that could make me miss my period? I haven’t been stressed, eating or exercising differently. I’m not sure what to do.