I am 4 days late. I took a pregnancy test today and it came back negative. I have been having cramp like feelings, my breast have been hurting, i have had a headache and have had lower back pains. About three weeks ago I had really bad cramping for a few days and then since then just a little bit of cramping here and there. I have been burping alot lately. My last period was july 7 and it was suppose to be aug 4 and now its the 8th and still nothing. Could I be pregnant or could it be something else?