Should I be bleeding?

My last period last 5 days and and was more like spotting the last 4 days, the period before that was very similar. But for the past week or so everytime me and my SO have sex I bleed after a dark dark color like a bricky brown color, could i be pregnant and thats why ive been bleeding, should I take a test? Ive never been pregnant before so I dont know if ita normal, he has a 4yr old from a previous relationship. When I told him about this he said I should take a test. I wasnt going to take a test till I missed my period. I asked my gramma and she said I shouldnt be to concerned?? Please help? Commmert if you wish please

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