Pregnant? or just an unusual period?

So I don't think I completely explained last post . I had my period may 14 , me and my husband have sex but he always pulls out however he didn't on the may 28, my period was supposed to be on the 18 of June but came on the tenth but it was spotting I didn't even need a pad or anything . I have taken pregnancy tests and so far I have had one but it is really faint plus sign, the others were negative I do not have a lot of money and would hate wasting money to find out I'm not what are my chances of being pregnant?