I had my last period may 5,2015 I had sex may 9,2015 I haven't seen my period since then. I sex again the end of June beginning of July but I still haven't seen my period I took several of pregnancy test I took 27 of them the first 25 said negative the 26 said positive with a real faint line barely see it the 27 said negative help what should I do.I use to feel little ffluttering here and there but not no more my breast Dont be sore but my nipples do every once in a while I use to burp and I can taste throw up in my mouth and my appetite had picked up real bad but now its not as bad help me what I do Iwent to a clinic they test came back negative