I took 4 first repsonse pregnancey test & they came out positive. but in all test the first line is really light & the second one is dark. am i prego?

Pregnant: Two lines is a positive test. It doesn't matter the darkness of the lines - just that they are there.

Early pregnancy?: It's possible that a very early pregnancy may be barely picked up by the hpt. If repeated in a couple of days, positive test should be more distinct. If there is any doubt, may follow-up with physician's office and obtain a serum pregnancy test which is much more sensitive and accurate.