I've missed my mp (5 days over due) but pregnancy test are negative have symptoms(crams no blood) but it's neg. what can be going on?too early 2 know

Redo test: If you have symptoms of pregnancy, it would be prudent to repeat the test in 3-4 days. Use first morning urine and follow the instructions for the test carefully. As an alternative you could see your doctor for a more sensitive blood test. See this site for early signs of pregnancy: http://www.webmd.com/baby/guide/pregnancy-am-i-pregnant