You missed your period since june. You had sex in june but at first the guy didn't have on a condom he went in and came out right after where he proceeded to put on a condom. After your missed period you spotted twice in july. After realizing you did in fact spot the first time you took a pregnancy test which came out negative. Again after spotting the second time you took another pregnancy test and it also came out negative. Every other week you tried to take a pregnancy test. Your last two pregnancy test were two weeks ago and they were both negative. Total pregnancy test taken amount to 5 (all negative). Your period still has not come but your breast as of last week start hurting as it usually does when your period is coming. This week your nipples hurt. Can you still be pregnant or is it just hormones and stress?
Definitely get a blood test done. I've heard of this happening to some women.. No matter how many hpts they take they all come out negative despite them being pregnant. I'm not saying you're definitely preggers though, only a doctor can tell you that!