I was told by my midwives any blood in pregnancy is NOT normal and you should go and get checked out.. probably nothing but could mean different thingss
If there is any sign of blood you should call, could be something silly but always best to get checked out
If it is blood drops then I'd call. But if it's more blood in a mucus discharge it's totally normal.
I would call the doc ima ftm as well but ive done alota readimg and any drops of blood no matter how lil shud b checked to b on safe side