With my first I had brown spotting and I ended up miscarring I didn't have any pain or heavy bleeding till I lost my baby and I had the spotting for months I suggest getting it checked out its better to be safe than sorry it could be nothing but it could also be something
Happened to me too the dr said if it's dark it's nothing to worried about is just old blood that has to get out
Check with your OB. But I did .I had spotting in the beginning mainly after sex but it went away .They told me is was threatened miscarriage and to hold of on Sex orgasms or any type of straining for a while.
It could be plantation spotting or your uterus stretching id call ans check up your obgyn to be sure everythings ok just tonhe safe