I have tested after 1week one line was dark and...

Pregnancy test = two lines :
If your strip shows two lines , it means that you are pregnant , so you have to perfrom blood pregnancy test for confirm .
What are the sign and symptoms of Pregnancy ?
There are many signs and symptoms which can increase your suspicion of pregnancy , and these include :

• Delayed period .
• Nausea and vomiting .
• Abdominal and low back pain .
• Breast pain .
• Changes in appetite .
• Positive pregnancy tests .

When can you perform pregnancy tests ?
You can confirm pergnancy by doing pregnancy tests ( After your expected period date ) and the tests include :

• Urine pregnancy test if your period was delayed .
• Blood Hcg level .

What to do at the moment ?
You need to perform Blood pregnancy test .