real period, or no?

so 3 weekends in a row, had sex bf cummed in me a total of 7 times. 
but today i think i started my period? idk its not like all my periods? its brown and like spotting but im cramping like a normal period. 
could i be pregnant but just spotting? 
can this be my actual period? 
- havent tooken a test 
- he funished in me on the 4 / 11 / 18 .