Is it normal to get a negative pregnancy test if you take it during the day?

Ok so lately I have taken 3 pregnancy test all negative though. But none were taken with first morning urine. I am now four days past due period and for the last two days I cant seem to keep anything down. I get really bloated with gas and it causes so much pain that I vomit. Its been like that for 2 days in a row now. Been exhausted, moody, having weird dreams, cramping here and there not bad though, been getting headaches, and breast dont really hurt but you can see my veins majorly in them. I plan on taking a pregnancy test in the morning with first urine pee but my thing is wouldn't I have gotten a positive by now If I am pregnant?