You can technically bleed at any point of a pregnancy. Symptoms however DO NOT mean anything. Heartburn, fatigue, cravings... these happen to us all regardless of gender. Retest again in a few days with first morning urine. Make sure to use a pink dye test as well. If this too is negative, see your doctor for blood testing to find out your hCG levels.
A test that uses pink dye. There are two kinds--one is blue due (the control line and test line are blue) and pink/red (the test line and control line will be pink/red).