My period is 8 days late. Home and blood tests say negative. Could I still be pregnant?

You mentioned that you were eight days late and you took a home pregnancy test and it was negative and you called your doctor and had a blood test done and it was too negative.  It's good that you took tests because the first sign of pregnancy is a missed period.  You should always rule pregnancy out if you're late.  It sounds like you did that.  The fact that you had a negative blood test, specifically, is a pretty reliable indicator that at this point you're not pregnant.  Home pregnancy tests are usually sensitive enough to pick up a pregnancy about the time that you would miss your period, so that's four to five weeks from your last period in most cases, unless you have extra long cycles.  They work by detecting a hormone called HCG which your body starts to secrete early on in pregnancy to support the pregnancy.  Levels rise exponentially each day until you're about eight to eleven weeks along.  Sometimes you can get false negatives if you take a test too soon but it sounds like since you're eight days passed your missed period and you had a negative blood test, like I said it's more specific and can pick up pregnancy way before urine tests, it sounds like you're not pregnant.  I do recommend following your doctor's advice and if your period hasn't started in another week then do retest and then call your doctor and determine if further investigation or testing is warranted at that point.  Good luck with everything and if you have more questions for me in the future, feel free to ask them on our Facebook page at Facebook: intermountainmoms and recommend us to your friends and family too.