please read!!

my daughter is almost 4 months, and yesterday i noticed i'm spotting. it's more like some bright red blood mixed in with everything else and it's just a little bit.. i haven't had sex in over a month and i used a condom. should i see my doctor or is this normal? my last period ended about a week and a half ago. i'm just curious about how everyone else would go about this!
EDIT: the condom didn't break, and his cum didn't go anywhere near my vag, so i'm 99.9999% i'm not pregnant.