Could you be still pregnant if your home test comes out negative and you get your period?

Yes, you could still be pregnant. Home tests are only 50% accurate in telling you whether you are or not when it comes out negative, but if it comes out positive then it is 99.9%, because there is a hormone your body produces only if you are pregnant called hCG but it can be very low at first in some women and a home test usually only picks up on it when it reaches 20.

How do you read a home pregnancy test?

When you do a HPT read the instructions carefully. Make sure the absorbent tip is properly soaked and then put the cap on within one minute. You shold see a clear line, or two if pregnant.

Is there any way to know if you are pregnant other than taking a test if you still have periods?

It is still possible to be pregnant but it depends on your symptoms and how soon you took a pregnancy test.
Some people believe it is very rare to have a period while being pregnant. However, it isnt that rare. Its more comman than most people think. I know someone who, up until her fourth month in pregnancy was having her period and in her second pregnancy she had her period for the full nine months!
Its best if you take a pregnancy test or visit your doctor for a blood test or failing that have an examination.

Is it possible to get a false positive when you take a pregnancy test at a clinic or hospital?

Anything is possible; however, they're usually always right. Sometimes home tests may not be able to detect the pregnancy hormone. If you are pregnant, congratulations, and be very happy!

Can you be pregnant if the test is negative?

Yes, you could be pregnant. Your best bet is to go to your doctor and get a serum hcg test done.

How many weeks does it take to know if you are pregnant?

For a home test you need to be at least one day late starting your period. I don't know for a doctor given blood test. Hope this helps!
For a doctor given blood test they suggest that you wait 3-5 days after your missed period. However, the test may be taken as soon as you suspect that you are pregnant.