I think i may be pregnant? Please help!

We have been trying to conceive for four months now but haven't been successful. I was supposed to start my period on the 8th of this month & still haven't started or even spotted. I have cramped & felt like I was gonna start my period for days before I was even supposed to start I still cramp every once in awhile but I never start. I took a test at 6:00pm on the 10th & it was negative, should I take another test except take it in the morning this time?