Confusing possible pregnancy?

About 3 weeks ago I took two home pregnancy tests that showed positive (barely, the lines were very faint but definitely there). Then I went to a pregnancy center a few days later and they tested my pee and it said negative. Now this was in Early August. Now that it's September I decided to test again. And I... show more About 3 weeks ago I took two home pregnancy tests that showed positive (barely, the lines were very faint but definitely there). Then I went to a pregnancy center a few days later and they tested my pee and it said negative. Now this was in Early August. Now that it's September I decided to test again. And I got a negative. The reason I tested again now is because I had no period in August and havent had one so far in September (I did have one that lasted all 7 days at the end of July). The period in July was my first one after being on birth control for a long time. Could I be missing periods randomly or could I be pregnant and it not be showing up on the tests?
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