I am 3 days late for my period and I have been having cramps all week like I'm about to start my period but I only get like it in the night and morning.. I also feel tired all the time and lower back ach my breast are sore.. I took a test today and it said negative.. can I still be pregnant?

Yes, wait another week and try the test again, and be sure it is first thing in the morning

At 3 days late it's likely way too early to test.

Wait another week, and if you still haven't gotten your period, try another test, using first morning urine and following the directions exactly.

If that test is negative wait until your next period would be due. If you miss it as well, test again, or see your doctor for a more accurate blood test.

So do it sound like I'm pregnant because me and my boyfriend have been trying to conceive?