I started my period August 3rd now it ended on the 9th. I had unprotected on the 12th or the 13th and I spotted on the 21st light brown like really really tiny then it was gone an then on the 22nd when I woke up there was light pink blood. Not even enough to fill a panty liner . And I did a hpt on the 25th it came up negative then I tested today on the 27th an it came up negative . Im not suppose to get my
Period till the 30th or the 31st so could I be pregnant? And when should I test again?

Pregnancy is possible.

It would be way too early to test.

Wait until your period is actually due. If you miss your period, then wait a week and test then. Make sure to use first morning urine. If that test is negative wait until your next period is due. If you miss that one as well then test again or see your doctor for a more accurate blood test.