Irregular Bleeding & Possible Pregnancy: What to Do

Question
I have never had a baby and so i dont know what its like. I was two weeks late on my period and i always start 21 days instead of 28. I finally started but its very light and its always heavy and iam only spotting its not a steady flow it stopped and started back spotting 24 hours later, and keeps on stopping and starting again. I went to a health unit and they made me take a pregnancy test and it came back negative, but they told me that some womens hormones dont kick in until they are two months pregnant, and that i might have to do a blood sample to find out if iam pregnant. so i wanted to get a secound opion about this and see what you thought do you think i could be pregnant?

Answer
The health clinic you went to was correct.  You could still be pregnant and your hormones could not be reactive enough to show pregnancy on a test.  This doesnt always mean pregnancy either.  Could be from stress, change in eatting habits, etc.  Blood samples often show pregnancy, and other illnesses, sooner than a regular urine test so a blood test would be your best bet.   good luck!