unprotected intercourse, now I feel some pregnancy symptoms, 4 positive and 2 negative tests

Hell I'm 20 I've took my bepo shot the afternoon my cycle has started me and my man been have sex with out a condom and now I've been have every pregnant feeling there is to feel . I've took a urine test negative I took 6 at home 4 postive and 2 negative can I still be pregnant? HELP ME PLEASE