Can you get dry socket with a Bone Graft? How do you detect this?

If a tooth has a large infection the desired protocol is to remove tooth and infected tissue with curette and adequate irrigation. Let socket heal for about a weak to let the body manage the infected tissue. The dentist will then re-enter the site, graft, suture, and obtain primary closure. Since the tooth was grafted at time of extraction your risk of dry socket is higher. Are you a smoker? On birth control? All of these can interfere with proper clotting. Pain start 2-3 days after procedure? If so most likely dry socket.

Detection of a dry socket is pain, but presence of pain does not mean dry socket.  A dry socket is simply a description.  It is when the space previously occupied by a root loses its clot and is an empty space.  A graft prevents this by filling the space with material to induce healing and bone formation while preserving bone volume.  What you are experiencing is likely NOT a dry socket and most likely attributed to the infection, or the graft material is integrating with the bone.  I don't know what you mean by the sealant coming out of the gums (sealants are plastic fillings placed in the grooves of decay prone teeth).  Perhaps a membrane was used to hold the graft material?  If your doctor says everything looks great, then you likely just need to give it all more time to heal.  Pain can sometimes last 2 weeks.