Hey I Had Two Periods In Aug 2015 And They

hey I had two periods in aug 2015 and they was both normal in sept didn't have one and oct I been on addipex and in sept I weight 171 and went back to doctor in oct 28 2015 weight 166 tooked home pregnancy test before went to doctor in oct it was negative got a flu shot that day too and been on my new addipex since then and today I tooked a home prgancy test and said positive could flu shot be given me false positive results I don't feel any pregnancy systems