I am suppose to start my cycle on the 8th of july. On the 6th I started spotting very light pink and then it stopped. Could I be pregnant?

Check preg test. Home pregnancy tests are very accurate. They are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. The best time to take one is when you miss your period. If you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection.