Trying to conceive. hint of blood just on tip of finger when i check cervix; period 3 days late. two negative pregnancy tests. was the spot my period?

Not necessarily: If you do not get a regular period in 4-5 days, do a home pregnancy test. If the result is negative re do the test 4-5 days, unless you a get a period by then. Use first morning urine and follow the instructions for the test carefully. Alternatively, you could get a blood test for HCG, from your doctor. Blood test should be positive now, if you are pregnant.