Hello,
Blood pregnancy tests are fairly accurate and more specific than urine for pregnancy tests. if it has come out negative then chances of pregnancy are less.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
If you have had your period and it is normal then you can rule out the chance of pregnancy. If not you should see your doctor for further work up.