Maybe I'm pregnant?

Ok so last month I had my period 5-9th of June after that I spotted for 2 days the 23-24th and since then I have had some slight cramps but absolutely no blood the spotting was not to much but not a little either I took a test about the 30th and it said not pregnant but I haven't taken another one! Have any of you experienced this? Should I go ahead and take another test? Mind you the test was clear blue the one with weeks estimated??