Thanks for the query.
The possible causes are:
Post coital tear leading to spotting.
Cervical erosion, polyp etc.
because of implant.
So usually these type of spotting will subside soon.
If persists or becomes severe better to consult gynecologist once to get examined to rule out the possible cause and take treatment accordingly.
Your lump could be bartholin cyst
. That can also be gotten examined in the same sitting.