dont know if um pregnant

brittany
my last shot was Dec 6 2013 my first cycle was June 15 2014 I has sex that night n the next day to my cycle stop than I saw light red on the 19 then it turned brown I was 110 now um 113.0 on the 21 I saw brown discharge n I had sex this morning I just let the clinic on the second was 110 could I be pregnant