Period is late

So I am 4 days late...😀😀😀 the only thing I experience is lower back pain and my taste buds has changed. I don't know what I want to eat but I know I want to eat something but when I eat whatever it is it tastes so weird and different and I don't want to eat it anymore. I take a pregnancy test 2 days ago and it was negative.. so I was going to wait this week and try it again on Friday to see what the results are and I'm just extremely thirsty. I have two kids already and I have not felt this before. what are some of y'alls experiences with being 4 days late. thanks thanks