Sounds to me like you still have your cervix?
If so then it is quite possible that there is a tiny amount of endometrial tissue in the cervix that is still affect by hormones hence the small amount of bleeding.
The bit about bleeding after making love could be a couple of things, either you guys need to take it a bit easier *wink wink* or there could be a small spot of tissue on the cervix (or the cuff) that hasn't fully 100% healed.

Both of these can be fixed by a simple silver nitrate treatment that your gynae can do as a quick outpatient appointment. Most people find it painless, some will feel a small tickle-pinch

however, as I am not a doctor and have never met you I can be sure my suggestion is correct so I would advise that you make an appointment to see your gynae for a check up and tell him/her about the bleeding.