Negative hpt but no AF?

My last period was on the 2nd of July and I was due for it this month on the 4th. Still nada. I usually have the worst pains before my period but i feel nothing. I feel bloated, a bit nauseous and very light cramping. (I usually have the worst aches on my lower back and abdomen) I woke up this morning at 3AM as a nervous wreck because I was so afraid of a negative and I ended up testing at 4AM and got a negative (below.) should I test again? Anyone else going through the same thing? I'm fairly regular, the most I'm ever late is a day or two.